4m+9=5m-12=42

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Solution for 4m+9=5m-12=42 equation: 



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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