5x-7 = 4x+1,5, 2x+(5-6x) = 45, 5x-(7x+7) = 9, 5x+3 = 7x-5(2x+1), 6x+(5-2x) = 2(2x+4) решите пожалуйста

5х - 7=4х + 1.5
5х-4х=1.5+7
х=8.5

2х+ (5-6х)=45
2х+5-6х=45
2х-6х=45-5
-4х=40
х=-10

5х-(7х+7)=9
5х-7х-7=9
5х-7х=9+7
-2х=16
х=-8

5х+3=7х-5(2х+1)
5х+3=7х-10х+5
5х-7х+10х=5-3
8х=2
х=4

6х+(5-2х)=2(2х+4)
6х+5-2х=4х+8
6х-2х-4х=8-5
х=3