1)3х+2•(2х-3)=8-7(х-2)
3х + 4х - 6 = 8 - 7х + 14
3х + 4х + 7х = 8 + 14 + 6
14х = 28
х = 28 ÷14
х = 2
2)3•(2х-5)-4х=5•(х-9)+27
6х - 15 - 4х = 5х - 45 + 27
6х - 4х - 5х = -45 + 27 + 15
- 3х = -3
х = 3÷3
х = 1
3)7•(х-5)-3•(1-2х)=16-3•(2х-1)
7х - 35 - 3 + 6х = 16 - 6х + 3
7х + 6х + 6х = 16 + 3 + 35 + 3
19х = 57
х = 57÷19
х = 3