Question

como se resolve essa equaçao 5x + 7 = -2x - 21

Answer 1

5x + 7 = -2x - 21 

5x + 2x = -21 - 7

7x = -28

x = -28/7 

x=  -4

Answer 2

5x + 7 = -2x - 215x + 2x = - 21 - 7

7x = - 28

x = - 4