Question

si 4-2y=7y+13 entonces y=

Answer 1

4 - 2y = 7y + 13

-2y - 7y = 13 - 4

-9y = 9

y = 9/-9

y = -1

Respuesta : 

y = -1

Answer 2

4-2y=7y+13
4-13= 7y+2y
-9 = 9y

-9/9 = y

-1 = y