9+3r=21

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Solution for 9+3r=21 equation: 



9+3r=21

We move all terms to the left:

9+3r-(21)=0

We add all the numbers together, and all the variables

3r-12=0

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

3r=12

r=12/3

r=4

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