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13=3r-14
We move all terms to the left:
13-(3r-14)=0
We get rid of parentheses
-3r+14+13=0
We add all the numbers together, and all the variables
-3r+27=0
We move all terms containing r to the left, all other terms to the right
-3r=-27
r=-27/-3
r=+9
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