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-3(5m+6)=87
We move all terms to the left:
-3(5m+6)-(87)=0
We multiply parentheses
-15m-18-87=0
We add all the numbers together, and all the variables
-15m-105=0
We move all terms containing m to the left, all other terms to the right
-15m=105
m=105/-15
m=-7
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