Respuesta :

Zainab0786

Answer:

-3

Step-by-step explanation:

12x+15=3x+12

12x-3x=-15+12

9x =-3

9÷-3

x=-3

Answer:

X= - 1/3

Step-by-step explanation:

3(4x+5) = 3x+12

12x + 15 = 3x + 12

12x - 3x = 12 - 15

9x = - 3

X = -3/9 = - 1/3

Hope this helps..