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10r=12r+8
We move all terms to the left:
10r-(12r+8)=0
We get rid of parentheses
10r-12r-8=0
We add all the numbers together, and all the variables
-2r-8=0
We move all terms containing r to the left, all other terms to the right
-2r=8
r=8/-2
r=-4
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