Решите уравнение а)8x+16=x-3 +5)+(2x-12)=x-3 в)2*(x+5,4)-3*(7,2-x)=8

8х+16=х-3
8х-х=16-3
7х=19
х=-2.7

-(х+5)+(2х-12)=х-3
х-5-2х+12=х-3
х-2х-х=5-12-3
-2х=-10
х=5

2*(х+5.4)-3*(7.2-х)=8
2х+10.8-21.6-3х=8
2х-3х=8-10.8+21.6
-1х=18.8
х=-18.8