Question

M plus 4 equals minus 12

Answer 1

Your equation will looks like this

M + 4 = -12
 
and then if you want to solve it than that's how you do it?

m+4=−12
Step 1: Subtract 4 from both sides.
m+4−4=−12−4 
m=-12-4  then subtract

m= -16

Answer: m=−16

Answer 2

M + 4 = -12
Subtract 4 from both sides
Final Answer: M = -16