1)2(x+5)-3=9, 2х+10-3=9,2х=9+3-10, 2х=2,х=1
2)7+4(x+1)=15
7+4х+4=15
4х=15-7-4,
4х=4,
х=1
3) х+2(x+7)=8,
х+2х+14=8,
3х= 8 - 14,
3х= - 6,
х = -2
4) 2x+2(x+3)=10,
2х + 2х + 6 = 10,
4х = 10-6
4х = 4
х =1
5) 3(x-2)-5x=2
3х - 6 - 5х = 2
3х - 5х = 2 + 6
- 2х = 8
х = 8:(-2)
х =-4