3r-9=21

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Solution for 3r-9=21 equation: 



3r-9=21

We move all terms to the left:

3r-9-(21)=0

We add all the numbers together, and all the variables

3r-30=0

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

3r=30

r=30/3

r=10

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