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17+r/3=-28
We move all terms to the left:
17+r/3-(-28)=0
We add all the numbers together, and all the variables
r/3+45=0
We multiply all the terms by the denominator
r+45*3=0
We add all the numbers together, and all the variables
r+135=0
We move all terms containing r to the left, all other terms to the right
r=-135
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