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12r=9r-59
We move all terms to the left:
12r-(9r-59)=0
We get rid of parentheses
12r-9r+59=0
We add all the numbers together, and all the variables
3r+59=0
We move all terms containing r to the left, all other terms to the right
3r=-59
r=-59/3
r=-19+2/3
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