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4(r-2)=15
We move all terms to the left:
4(r-2)-(15)=0
We multiply parentheses
4r-8-15=0
We add all the numbers together, and all the variables
4r-23=0
We move all terms containing r to the left, all other terms to the right
4r=23
r=23/4
r=5+3/4
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