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60=12r-4-5r+8
We move all terms to the left:
60-(12r-4-5r+8)=0
We add all the numbers together, and all the variables
-(7r+4)+60=0
We get rid of parentheses
-7r-4+60=0
We add all the numbers together, and all the variables
-7r+56=0
We move all terms containing r to the left, all other terms to the right
-7r=-56
r=-56/-7
r=+8
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