5x = 8x - 154x + 1 = 2y - 5 = 3y - 255x + 6 = 10x + 59y - 11 = - 10x + 12y21 - 6x = 27 - 8x?

5x = 8x - 15

5x - 8x = - 15 - 3x = - 15

x = - 15 / - 3

x = 5

4x + 1 = 2

4x = 2 - 1

x = 1 / 4

y - 5 = 3y - 25

y - 3y = - 25 + 5 - 2y = - 20

2y = 20

y = 20 / 2

y = 10

5x + 6 = 10x + 5

5x - 10x = 5 - 6 - 5x = - 1

x = 1 / 5

9y - 11 = - 10x + 12y

21 - 6x = 27 - 8x

8x - 6x = 27 - 21

2x = 6

x = 6 / 2

x = 3.