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17=0.5r-8
We move all terms to the left:
17-(0.5r-8)=0
We get rid of parentheses
-0.5r+8+17=0
We add all the numbers together, and all the variables
-0.5r+25=0
We move all terms containing r to the left, all other terms to the right
-0.5r=-25
r=-25/-0.5
r=+50
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