861.
2) 3(х+5) = 7 - 5х 4) 4(х-9) = 3(х-8) 6) 7(3 - 2х) = 15(1-х)
3х +15 = 7 - 5х 4х - 36 = 3х -24 21 - 14х = 15 - 15х
3х + 5х = 7 - 15 4х -3х = - 24 +36 -14х +15х = 15 -21
8х = - 8 х = 12 х = - 6
х = -1
862.
4) 26 - (17 - 2х) = 5х
26 - 17 + 2х = 5х
2х -5х = 17 - 26
- 3х = - 9
х = 3