Question

решите уравнение, помогите...​

Answer 1

1)5х-12=3
5х=15
х=3
2)7х-12=-х+4
7х+х=4+12
8х=16
х=2
3)2(1+3х)=4х-10
2+6х=4х-10
6х-4х=-10-2
2х=-12
х=-6
4)2х+5=2(-х+1)+11
2х+5=-2х+2+11
2х+5=-2х+13
2х+2х=13-5
4х=8
х=2
5)6у-3(у-1)=4+5у
6у-3у+3=4+5у
3у+3=4+5у
3у-5у=4-3
-2у=1
у=-1/2=-0,5