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12=-3(m-17)
We move all terms to the left:
12-(-3(m-17))=0
We calculate terms in parentheses: -(-3(m-17)), so:We get rid of parentheses
-3(m-17)
We multiply parentheses
-3m+51
Back to the equation:
-(-3m+51)
3m-51+12=0
We add all the numbers together, and all the variables
3m-39=0
We move all terms containing m to the left, all other terms to the right
3m=39
m=39/3
m=13
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