Решить 5x+27=4x+21. и 4(3-2y)-42=2(3+2y)

5x+27=4x+21

5x - 4x = 21 - 27

x = -6

ответ: -6.

4(3-2y)-42=2(3+2y)

12 - 8y - 42 = 6 + 4y

-8y - 4y = 6 + 42 - 12

- 12y = 36

y = -3

ответ: - 3.

5x+27=4x+21

x+27-21=0

x+6=0

x=-6

4(3-2y)-42=2(3+2y)

12-8y-42-2*(3+2y)=0

-30-8y-2*(3+2y)=0

-30-8y-(6+4y)=0

-30-8y-6-4y=0

-36-8y-4y=0

-36-12y=0

y=-36/12

y=-3