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6r-6=-9r+9
We move all terms to the left:
6r-6-(-9r+9)=0
We get rid of parentheses
6r+9r-9-6=0
We add all the numbers together, and all the variables
15r-15=0
We move all terms containing r to the left, all other terms to the right
15r=15
r=15/15
r=1
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