r-21=2r+112

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Solution for r-21=2r+112 equation: 



r-21=2r+112

We move all terms to the left:

r-21-(2r+112)=0

We get rid of parentheses

r-2r-112-21=0

We add all the numbers together, and all the variables

-1r-133=0

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

-r=133

r=133/-1

r=-133

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