2r+21=5r

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Solution for 2r+21=5r equation: 



2r+21=5r

We move all terms to the left:

2r+21-(5r)=0

We add all the numbers together, and all the variables

-3r+21=0

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

-3r=-21

r=-21/-3

r=+7

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