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r/5+9=20
We move all terms to the left:
r/5+9-(20)=0
We add all the numbers together, and all the variables
r/5-11=0
We multiply all the terms by the denominator
r-11*5=0
We add all the numbers together, and all the variables
r-55=0
We move all terms containing r to the left, all other terms to the right
r=55
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