5х+15+7=3х+36
5х-3х=36-15-7
2х=14
х=14:2
х=7
5 ( х + 3) +7 = 3 ( х +12)
5х + 15 + 7 = 3х + 36
5х - 3х = 36 - 15 - 7
2х = 14
х = 14 : 2
х = 7
5х+15+7=3х+36
5х-3х=36-15-7
2х=14
х=14:2
х=7
5 ( х + 3) +7 = 3 ( х +12)
5х + 15 + 7 = 3х + 36
5х - 3х = 36 - 15 - 7
2х = 14
х = 14 : 2
х = 7