7х+15=2х-6
5х=-6-15
5х=-21
х=-21/5
7х + 15 = 2(х-3)
7х + 15 = 2х - 6
7х - 2х= -6 - 15
5х = -21
х = -21 ÷ 5
х = -4,2
7х+15=2х-6
5х=-6-15
5х=-21
х=-21/5
7х + 15 = 2(х-3)
7х + 15 = 2х - 6
7х - 2х= -6 - 15
5х = -21
х = -21 ÷ 5
х = -4,2