3x+2 chc x+2

=>3x+6 -3x-2 chc x+2

=>4 chc x+2

Tìm Ư(4) rồi suy ra x là xong 

tick cho mình nha

Viết mệt lắm, bài này dễ mà

Hỏi ngu

1.sao chia 2 du 3 dc,the thanh du 1 roi

2.neu so do la x thi lam sao co h dc

phai co > 2 so moi co h

7 - x = 8 - ( -7 )

7 - x = 8 + 7

7 - x = 15

     x = 7 - 15

     x = -8

k cho mình nha

7-x=8-(-7)

7-x=15

  x=7-15

  x= -8

\(a)x=\dfrac{1}{4}+\dfrac{5}{13}=\dfrac{33}{52}.\\ b)\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}.\\ \Leftrightarrow\dfrac{x}{3}=\dfrac{11}{21}.\\ \Leftrightarrow\dfrac{7x}{21}=\dfrac{11}{21}.\\ \Rightarrow7x=11.\\ \Leftrightarrow x=\dfrac{11}{7}.\\ c)\dfrac{x}{3}=\dfrac{16}{24}+\dfrac{24}{36}=\dfrac{2}{3}+\dfrac{2}{3}=\dfrac{4}{3}.\\ \Rightarrow x=4.\\ d)\dfrac{x}{15}=\dfrac{1}{5}+\dfrac{2}{3}=\dfrac{13}{15}.\\ \Rightarrow x=13.\)

\(2x+25\%x=-2,25\)

\(\Leftrightarrow2x+\frac{25}{100}x=-\frac{225}{100}\)

\(\Leftrightarrow2x+\frac{1}{4}x=-\frac{9}{4}\)

\(\Leftrightarrow x\left(2+\frac{1}{4}\right)=-\frac{9}{4}\)

\(\Leftrightarrow\frac{9}{4}x=-\frac{9}{4}\)

\(\Leftrightarrow x=-\frac{9}{4}\div\frac{9}{4}\)

\(\Leftrightarrow x=-1\)

\(2x+25\%x=-2,25\)

\(2x+0,25x=-2,25\)

\(x.\left(2+0,25\right)=-2,25\)

\(x.2,25=-2,25\)

\(x=-2,25:2,25\)

\(x=-1\)

~Học tốt~