-2r+15=21

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Solution for -2r+15=21 equation: 



-2r+15=21

We move all terms to the left:

-2r+15-(21)=0

We add all the numbers together, and all the variables

-2r-6=0

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

-2r=6

r=6/-2

r=-3

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