1. -12х-3=11х-3
-12x-11x=-3+3
-23x=0
x=0
2. 1,4-0,6у=0,7-0,5у
-0.6y+0.5y=0.7-1.4
-0.1y=-0.7
y=7
3. 16-3х=4-7х
7x-3x=4-16
4x=-12
x=-3
4. 4х+(11,8-3х)=5,8-5х
4x+11.8-3x=5.8-5x
4x-3x+5x=5.8-11.8
6x=-6
x=-1
5. 4у+12=3у+8
4y-3y=8-12
y=-4
6. 3(4х-5)=3х-6
12x-15=3x-6
12x-3x=15-6
9x=9
x=1
7. 3у-17=8у+18
3y-8y=18+17
-5y=35
y=-7
8. 0,18х-2,83=0,19х-2,89
0.18x-0.19x=-2.89+2.83
-0.01x=-0.06
x=6
9. 5(у+7)=3(у+4)+27
5y+35=3y+12+27
5y-3y=12+27-35
2y=4
y=2