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-4=r/18-5
We move all terms to the left:
-4-(r/18-5)=0
We get rid of parentheses
-r/18+5-4=0
We multiply all the terms by the denominator
-r+5*18-4*18=0
We add all the numbers together, and all the variables
-1r+18=0
We move all terms containing r to the left, all other terms to the right
-r=-18
r=-18/-1
r=+18
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