20-3m=7

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Solution for 20-3m=7 equation: 



20-3m=7

We move all terms to the left:

20-3m-(7)=0

We add all the numbers together, and all the variables

-3m+13=0

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

-3m=-13

m=-13/-3

m=4+1/3

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