22 1/2*4/5=45/2*4/5=18 градусов
2) (x-6)*3=3x
3x-18=3x
3x-3x=18
0=0 (нет ответ)
3) (2 (х+1)-2-х)/4=3
(2х+2-2-х)/4=3
х=12
4) (4 (2х-3)-3 (х-5))/12=2
(8х-12-3х+15)/12=2
(5х+3)/12=2
5х+3=24
5х=21
х=4 1/5=4,2
5) (4х-1)/3=х+7
4х-1=3х+21
х=20
6) (8х+3)/7=х-1
8х+3=7х-7
х=-10