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10=r/2+12
We move all terms to the left:
10-(r/2+12)=0
We get rid of parentheses
-r/2-12+10=0
We multiply all the terms by the denominator
-r-12*2+10*2=0
We add all the numbers together, and all the variables
-1r-4=0
We move all terms containing r to the left, all other terms to the right
-r=4
r=4/-1
r=-4
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