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-18.07-r=0.5
We move all terms to the left:
-18.07-r-(0.5)=0
We add all the numbers together, and all the variables
-1r-18.57=0
We move all terms containing r to the left, all other terms to the right
-r=18.57
r=18.57/-1
r=-18+0.57/1
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