А) 4х+12=5х+6
4х-5х=6-12
х=6
б)3х-17=8х+23
3х-8х=17+23
-5х=40
х=40:(-5)
х=-8
в)5х-30=7х-8
5х-7х=30-8
-2х=22
х=22:(-2)
х=-11
г)10х+16=7х-11
10х-7х=-16-11
3х=-27
х=-27:3
х=-9
д) 4•(3-х)-11=7•(2х-5)
12-4х-11=14х-35
-4х-14х=-12+11-35
-18х=-36
х=-36:(-18)
х=2
е)3(5-х)+13=4(3х-8)
15-3х+13=12х-32
-3х-12х=-15-13-32
-15х=-60
х=-60:(-15)
х=4
ж)2(3+2х)=4(3-2х)+24
6+4х=12-8х+24
4х+8х=-6+12+24
12х=30
х=30:12
х=2,5
з)8(1-0,5х)=-6(9-2х)
8-4х=-54+12х
-4х-12х=-8-54
-16х=-62
х=-62:(-16)
х=3,875