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5(12-r)=13
We move all terms to the left:
5(12-r)-(13)=0
We add all the numbers together, and all the variables
5(-1r+12)-13=0
We multiply parentheses
-5r+60-13=0
We add all the numbers together, and all the variables
-5r+47=0
We move all terms containing r to the left, all other terms to the right
-5r=-47
r=-47/-5
r=9+2/5
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