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7m+4=+-16+2m
We move all terms to the left:
7m+4-(+-16+2m)=0
We add all the numbers together, and all the variables
7m-(2m-16)+4=0
We get rid of parentheses
7m-2m+16+4=0
We add all the numbers together, and all the variables
5m+20=0
We move all terms containing m to the left, all other terms to the right
5m=-20
m=-20/5
m=-4
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