Question

Решите уравнение
(3x-12)-(7x-5)=9



5x+20=3x-4(x-2)

Answer 1

(3x-12)-(7x-5)=9
3x-12 -7x + 5 =9
4 х =  -16
х = - 4

5x+20=3x-4(x-2)
5x + 20 = 3x -4x + 8
6х = -12
х = - 2 

Answer 2

(3х-12)-(7х-5)=9
3х-12-7х+5=9
-4х=16
х=-4.

5х+20=3х-4(х-2)
5х+20=3х-4х+8
5х-3х+4х=8-20
6х=-12
х=-2.