15х+3=10х-12

-5х-11=-6х-12

3х+5=8х-15

5х+15=27+3х

3у+(4-2у)=6

5у-(13+у)=у+14

3(2х-4)-2(х+3)=-2

4у-3=2(7-у)+1

15х + 3 = 10х - 12

15x - 10x = -12 - 3

5x = -15

x = -15 : 5

x = -3

Ответ: -3

.

-5х - 11 = -6х - 12

-5x + 6x = -12 + 11

x = -1

Ответ: -1

.

3х + 5 = 8х - 15

3x - 8x = -15 - 5

-5x = -20

x = -20 : (-5)

x = 4

Ответ: 4

.

5х + 15 = 27 + 3х

5x - 3x = 27 - 15

2x = 12

x = 12 : 2

x = 6

Ответ: 6

.

3у + (4 - 2у) = 6

3y + 4 - 2y = 6

y = 6 - 4

y = 2

Ответ: 2

.

5у - (13 + у) = у + 14

5y - 13 - y = y + 14

4y - y = 14 + 13

3y = 27

y = 27 : 3

y = 9

Ответ: 9

.

3(2х - 4) - 2(х + 3) = -2

6x - 12 - 2x - 6 = -2

4x - 18 = -2

4x = -2 + 18

4x = 16

x = 16 : 4

x = 4

Ответ: 4

.

4у - 3 = 2(7 - у) + 1

4y - 3 = 14 - 2y + 1

4y + 2y = 15 + 3

6y = 18

y = 18 : 6

y = 3

Ответ: 3