1. -12x-3=11x-3

-12x-11x=3+3

-21x=0

x=0

2. 1.4-0.6y=0.7-0.5y

-0.6y+0.5y=0.7-1.4

-0.1y=-0.7

y=7

3)

16-3x=4-7x

-3x+7x=4-16

4x=-12

x=-3

4)4x+(11.8-3x)=5.8-5x

4x+11,8-3x=5.8-5x

x+11.8=5.8-5x

6x=-6

x=-1

5) 4y-12=3y+8

4y-3y=8+12

x=20

6) 3(4x-5)=3x-6

12x-15=3x-6

12x-3x=-6+15

9x=9

x=1

7) 3y-17=8y+18

3y-8y=18+17

-5y=35

y=-7

8) 0.18x-2.83=0.19x-2.89

0.18x-0.19x=-2.89+2.83

-0.1x=-0.06

x=6

9) 5(y+7)=3(y+4)+27

5y+35=3y+12+27

5y-3y=12+27-35

2y=4

y=2

ответ смотри на фотографии