a) x= - 15

b) x= - 2

c) x= -12 

d) x= -2 

a) ( 2x - 3 ) - ( x - 5 ) = ( x + 7 ) - ( x + 2 ) 

<=> 2x - 3 - x + 5 = x + 7 - x - 2

<=> x = 3

b)(7x-5)-(6x+4)=(2x+3)-(2x+1)

<=> 7x - 5 - 6x - 4 = 2x + 3 - 2x - 1

<=> x = 11

c)(9x-3)-(8x+5)=(3x+2)

<=> 9x - 3 - 8x - 5 = 3x + 2

<=> -2x = 10

<=> x = -5

d)(x+7)-(2x+3)=(3x+5)-(2x+4)

<=> x + 7 - 2x - 3 = 3x + 5 - 2x - 4

<=> -2x = -3

<=> x = 3/2

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\(a,5x-16=40-1\)

<=>\(5x=40-1+16\)

<=>\(5x=55\)

<=>\(x=11\)

\(b,x-10=-25\)

<=>\(x=\left(-25\right)-10\)

<=>\(x=-35\)

\(c,-12+x=-30\)

<=>\(x=\left(-30\right)+12\)

<=>\(x=-18\)

a) 5x-16=40-1

5x-16=39

5x=39+16

5x=55

x=55:5

x=11

b)x-10=(-25)

x=(-25)+10

x=(-15)

c) -12+x= -30

           x= -30-(-12)

           x= -30+12

           x= -18

d) 2x +12 = -40+ 6

2x+12=(-34)

2x=(-34)-12

2x=(-46)

x=(-46):2

x=(-23)

e)125:(3x-13)=25

3x-13=125:25

3x-13=5

3x=5+13

3x=18

x=18:3

x=6

f)541+(218-x)=735

218-x=735-541

218-x=194

x=218-194

x=  24

g) 3(2x+1)-19=14

3(2x+1)=14+19

3(2x+1)=33

2x+1=33:3

2x+1=11

2x=11-1

2x=10

x=10:2

x=5

h)175-5(x+3)=85

5(x+3)=175-85

5(x+3)=90

x+3=90:5

x+3=18

x=18-3

x=15

i)8x+(-3)=39

8x=39-(-3)

8x=42

x=42:8

x=42/8

L)2x+4x=36+(-6)

6x=30

x=30:6

x=5

a) -2x -12 = 8 - 6x + 60

\(\Leftrightarrow\)-2x + 6x = 8 + 60 + 12

\(\Leftrightarrow\)4x = 80

\(\Leftrightarrow\)x= 80 : 4

\(\Leftrightarrow\)x=20

vậy x = 20

b) -8x - 36 = ( x+13 ) + ( -8x + 3 )

-8x - 36 = x + 13 - 8x + 3

-8x -x + 8x = 13 + 3 + 36

-x = 52

x = - 52

Vậy x = - 52

c) 1 + x - 10 - 6x = 4 - 5x

x - 6x + 5x = 4 -1 + 10

0x = 13

vậy x = 0

d)6 - 3x + 1 = -3x + 7

-3x + 3x = 7 - 6 - 1

0x = 0

vậy x = 0

Trần Tuyết Tâm

a) <=> -2x+6x=8+60+12

   <=>  4x  = 80

   <=>  x= 20

b)  <=> -8x-36=x+13-8x+3

    <=>  -8x+8x-x=13+3+36

    <=>   -x=52 => x=-52

c) <=> x+5x-6x=4-1+10

    <=>  0x  = 13 => x=0

d) <=> -3x+3x=7-1-6

<=>    0x=0 => x=0

XL mik ko ghi lại đề thông cảm

`(5x+1)=36/49`

`<=> 5x = 36/49-1`

`<=> 5x = -13/49`.

`<=> x = -13/245.`

Vậy `x = -13/245`.

`b, x-2/9 = 2/3`.

`<=> x = 2/3 + 2/9`

`<=> x = 8/9`.

Vậy `x = 8/9`.

c: (8x-1)^(2x+1)=5^(2x+1)

=>8x-1=5

=>8x=6

=>x=3/4

d: Sửa đề: (x-3,5)^2+(y-1/10)^4=0

=>x-3,5=0 và y-0,1=0

=>x=3,5 và y=0,1