m+(m+5)=21

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Solution for m+(m+5)=21 equation: 



m+(m+5)=21

We move all terms to the left:

m+(m+5)-(21)=0

We get rid of parentheses

m+m+5-21=0

We add all the numbers together, and all the variables

2m-16=0

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

2m=16

m=16/2

m=8

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