Question

- 7 m + 3 m -8=20 cuanto da m

Answer 1

-7m + 3m - 8 = 20

-4m -8 = 20

-8 - 20 = 4m

-28 = 4m  ---------->  m = -7 

Answer 2

Resolver.

- 7m + 3m - 8 = 20
- 4m - 8 = 20
- 4m = 20 + 8
- 4m = 28
m = 28 / - 4
m = - 7

Respuesta.
m = - 7