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5=10-r/2
We move all terms to the left:
5-(10-r/2)=0
We add all the numbers together, and all the variables
-(-r/2+10)+5=0
We get rid of parentheses
r/2-10+5=0
We multiply all the terms by the denominator
r-10*2+5*2=0
We add all the numbers together, and all the variables
r-10=0
We move all terms containing r to the left, all other terms to the right
r=10
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