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5=r/15+4
We move all terms to the left:
5-(r/15+4)=0
We get rid of parentheses
-r/15-4+5=0
We multiply all the terms by the denominator
-r-4*15+5*15=0
We add all the numbers together, and all the variables
-1r+15=0
We move all terms containing r to the left, all other terms to the right
-r=-15
r=-15/-1
r=+15
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