-9r+3=21

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Solution for -9r+3=21 equation: 



-9r+3=21

We move all terms to the left:

-9r+3-(21)=0

We add all the numbers together, and all the variables

-9r-18=0

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

-9r=18

r=18/-9

r=-2

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