1) х = 7, 2) х = 3, 3) х =2, 4) х = 10, 5) х = 3, 6) х = 10, 7) х = 15, 8) х = 5, 9) х = 3, 10) х = 1
Пошаговое объяснение:
1) 3х = 13 + 8
3х = 21 х = 21 : 3
х = 7
2) 5х = 27 - 12
5х = 15 х = 15 : 5
х = 3
3) 12х - 8х = 8
4х = 8 х = 8 : 4
х = 2
4) 6х + 12х = 180
18х = 180 х = 180 : 18
х = 10
5) 13х - 8х = 15
5х = 15 х = 15 : 5
х = 3
6) 7х - 5х = 20
2х = 20 х = 20 : 2
х = 10
7) 3х - 2х = 10 + 5
х = 15
8) 3х - 2х = 10 - 5
х = 5
9) 3х + 2х = 10 +5
5х = 15 х = 15 : 5
х = 3
10) 3х +2х = 10 - 5
5х = 5 х = 5 : 5
х = 1