Question

Решите уравнение:
5-2(х-1)=7+5

Answer 1

5-2(х-1)=7+5
5-2х+2=7+5
-2х=7+5-5-2
-2х=5
х=5:(-2)
х=-2.5

Answer 2

5-2(x-1)=12

2-2x+5=12

(5+2)-2x=12

7-2x=12

-2x=12-7

-2x=5

$x=frac{-5}{2}$