12m-5-4m-9=15+13m-8-8m

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Solution for 12m-5-4m-9=15+13m-8-8m equation: 



12m-5-4m-9=15+13m-8-8m

We move all terms to the left:

12m-5-4m-9-(15+13m-8-8m)=0

We add all the numbers together, and all the variables

12m-4m-(5m+7)-5-9=0

We add all the numbers together, and all the variables

8m-(5m+7)-14=0

We get rid of parentheses

8m-5m-7-14=0

We add all the numbers together, and all the variables

3m-21=0

We move all terms containing m to the left, all other terms to the right

3m=21

m=21/3

m=7

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