Respuesta :

Step-by-step explanation:

3x + a = 5x +b

(3x + a) + (-a -5x) +5x +b0 + (-a -5x)

3x + a -a = 5x - 5x + b -a

-2x = b -a

2x / 2 = - b -a / 2

x = - b -a / 2