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r/4-8=7
We move all terms to the left:
r/4-8-(7)=0
We add all the numbers together, and all the variables
r/4-15=0
We multiply all the terms by the denominator
r-15*4=0
We add all the numbers together, and all the variables
r-60=0
We move all terms containing r to the left, all other terms to the right
r=60
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