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-5=12r+8
We move all terms to the left:
-5-(12r+8)=0
We get rid of parentheses
-12r-8-5=0
We add all the numbers together, and all the variables
-12r-13=0
We move all terms containing r to the left, all other terms to the right
-12r=13
r=13/-12
r=-1+1/12
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