Verified answer

5x+11+42=3x+21

2x=-32

x=-16

Verified answer

(3х + 21) - (5х + 11) = 42

3х + 21 - 5х - 11 = 42

3х - 5х = 42 - 21 + 11

- 2х = 32

х = 32 : (-2)

х = - 16