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r/20+-5=-4
We move all terms to the left:
r/20+-5-(-4)=0
We add all the numbers together, and all the variables
r/20-1=0
We multiply all the terms by the denominator
r-1*20=0
We add all the numbers together, and all the variables
r-20=0
We move all terms containing r to the left, all other terms to the right
r=20
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