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-84=-7(m+4)-m
We move all terms to the left:
-84-(-7(m+4)-m)=0
We calculate terms in parentheses: -(-7(m+4)-m), so:We get rid of parentheses
-7(m+4)-m
We add all the numbers together, and all the variables
-1m-7(m+4)
We multiply parentheses
-1m-7m-28
We add all the numbers together, and all the variables
-8m-28
Back to the equation:
-(-8m-28)
8m+28-84=0
We add all the numbers together, and all the variables
8m-56=0
We move all terms containing m to the left, all other terms to the right
8m=56
m=56/8
m=7
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