2(m+7)=20

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Solution for 2(m+7)=20 equation: 



2(m+7)=20

We move all terms to the left:

2(m+7)-(20)=0

We multiply parentheses

2m+14-20=0

We add all the numbers together, and all the variables

2m-6=0

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

2m=6

m=6/2

m=3

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