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r/4+8=9
We move all terms to the left:
r/4+8-(9)=0
We add all the numbers together, and all the variables
r/4-1=0
We multiply all the terms by the denominator
r-1*4=0
We add all the numbers together, and all the variables
r-4=0
We move all terms containing r to the left, all other terms to the right
r=4
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