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4m+9=5m-12=42
We move all terms to the left:
4m+9-(5m-12)=0
We get rid of parentheses
4m-5m+12+9=0
We add all the numbers together, and all the variables
-1m+21=0
We move all terms containing m to the left, all other terms to the right
-m=-21
m=-21/-1
m=+21
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