3r+12=87

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Solution for 3r+12=87 equation: 



3r+12=87

We move all terms to the left:

3r+12-(87)=0

We add all the numbers together, and all the variables

3r-75=0

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

3r=75

r=75/3

r=25

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