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-17+r/2=-25
We move all terms to the left:
-17+r/2-(-25)=0
We add all the numbers together, and all the variables
r/2+8=0
We multiply all the terms by the denominator
r+8*2=0
We add all the numbers together, and all the variables
r+16=0
We move all terms containing r to the left, all other terms to the right
r=-16
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