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r/5+12=18
We move all terms to the left:
r/5+12-(18)=0
We add all the numbers together, and all the variables
r/5-6=0
We multiply all the terms by the denominator
r-6*5=0
We add all the numbers together, and all the variables
r-30=0
We move all terms containing r to the left, all other terms to the right
r=30
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