Combine like terms and solve each equation WILL MARK BRAINLIEST
6x + 3x = 18

-5x + 13x = 64

6x - 5 + 7x = 34

12 - 10x + 5x = -18

8x - 6x - 3 + 8 = 81

-8x + 6x + 3 - 22 = 15

7x - 4x =27

-10x - 5x = 45

-15 + 3x -7x = -43

5x + 4x - 27 = 81

12x + 3 - 4x - 6 = 5

5x - 4 + 7 + 6x - 4x = 24