Question

Mọi người giúp mình với nha:

Tìm x biết : 1/2.x +1/5 = 2/3.x - 1/4

Answer 1

1/2x + 1/5 = 2/3x - 1/4

=> 1/2x - 2/3x = -1/4 - 1/5

=> -1/6x = -9/20

=> x = -9/20 : (-1/6)

=> x = 27/10

Answer 2

\(\frac{1}{2}x+\frac{1}{5}=\frac{2}{3}x-\frac{1}{4}\)

\(\frac{1}{2}x=\frac{2}{3}x-\frac{1}{4}-\frac{1}{5}\)

\(\frac{1}{2}x=-\frac{9}{20}+\frac{2x}{3}\)

\(\frac{1}{2}x=-\frac{9}{20}+\frac{2x}{3}-\frac{2x}{3}\)

\(-\frac{x}{6}=-\frac{9}{20}\)

\(6\left(-\frac{x}{6}\right)=6\left(-\frac{9}{20}\right)\)

\(-x=-\frac{27}{10}\)

\(\Rightarrow x=-\frac{27}{10}\)