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r/20-3=2
We move all terms to the left:
r/20-3-(2)=0
We add all the numbers together, and all the variables
r/20-5=0
We multiply all the terms by the denominator
r-5*20=0
We add all the numbers together, and all the variables
r-100=0
We move all terms containing r to the left, all other terms to the right
r=100
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