Question

Помогите решить !
7х-15=5х+5(2х+1) ???

Answer 1

7x-15=5x+5(2x+1)
7x-15=5x+10x+5
7x-5x-10x=5+15
-8x=20
x=-2.5

Answer 2

7х - 15 = 5х + 10х + 5
7х - 15 = 15х + 5
-8х = 20
х = -20/8
х = - 5/2
х = -2,5