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12-(4-m)=4
We move all terms to the left:
12-(4-m)-(4)=0
We add all the numbers together, and all the variables
-(-1m+4)+12-4=0
We add all the numbers together, and all the variables
-(-1m+4)+8=0
We get rid of parentheses
1m-4+8=0
We add all the numbers together, and all the variables
m+4=0
We move all terms containing m to the left, all other terms to the right
m=-4
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