-(а+2)+2(4-3а)= -а-2+8-6а=-7а+6
2х-3=5-3х 2х+3х=5+3 5х=8 х=8/5
4(-3,5+3х)=-3+10х
-14+12х=-3+10х
12х-10х=-3+14
2х=11
х= 11/2= 5,5
2,9y-4(1.2-y)=5.4(y+2)
2.9y-4.8+4y=5.4y+10.8
2.9y+4y-5.4y=10.8+4.8
12.3y=15.6
y=15.6/12.3
3/4х-(3/4-2х)=1 1/2+х
3/4х-3/4+2х=1 1/2+х
3,75х=9/4
х=9/4 /3,75
х=3/5