7m-3m=20

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Solution for 7m-3m=20 equation: 



7m-3m=20

We move all terms to the left:

7m-3m-(20)=0

We add all the numbers together, and all the variables

4m-20=0

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

4m=20

m=20/4

m=5

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