Respuesta :

The answer should be M = -12

-8 + m = -20
Add similar terms
-20 + 8 = -12

M = -12 should be correct.

Answer:

m=−12

−8+m=−20

Add 8 to both sides.

m=−20+8

Add −20 and 8 to get −12.

therefore are answer is m= -12