Question

ecuasio de 3y+7y+5y=-210

Answer 1

3y + 7y + 5y = -210
              15y = -210
                  y = -210/15
                  y = -14

listo :D

Answer 2

3y+7y+5y=-210
(3+7+5)y =-210
15y=-210
y=-210/15
y=-14 /R.

Saludos!