Уравнение:7х-5(2х+1)=5х+15

Question

Уравнение:
7х-5(2х+1)=5х+15

Answer 1

7x-5(2x+1)=5x+15
7x-10x-5=5x-15
7x-10x-5x=-15+5
-8x=-10
x=-10/(-8)
x=10/8=5/4

Comments

А как 15+5=10?

Answer 2

7х-10х+5=5х+15
-7х=10
х=-10/7