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r/15-4=-1
We move all terms to the left:
r/15-4-(-1)=0
We add all the numbers together, and all the variables
r/15-3=0
We multiply all the terms by the denominator
r-3*15=0
We add all the numbers together, and all the variables
r-45=0
We move all terms containing r to the left, all other terms to the right
r=45
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