1)-12-2х=-7х+48 2)1+3х=43+х 3)-2х-27=9х-115 решите уравнение

1)-12-2х=-7х+48 
-2х +7х = 48 +12
5х = 60
х = 60:5
х = 12
2)1+3х=43+х
3х -х = 43-1
2х =42
х = 42:2
х = 21
3)-2х-27=9х-115
-2х -9х = -115+27
-11х = -88
11х = 88
х = 88:11
х = 8