12r+15=21

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Solution for 12r+15=21 equation: 



12r+15=21

We move all terms to the left:

12r+15-(21)=0

We add all the numbers together, and all the variables

12r-6=0

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

12r=6

r=6/12

r=1/2

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