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15=r/2+10
We move all terms to the left:
15-(r/2+10)=0
We get rid of parentheses
-r/2-10+15=0
We multiply all the terms by the denominator
-r-10*2+15*2=0
We add all the numbers together, and all the variables
-1r+10=0
We move all terms containing r to the left, all other terms to the right
-r=-10
r=-10/-1
r=+10
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