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r/8+2=-8
We move all terms to the left:
r/8+2-(-8)=0
We add all the numbers together, and all the variables
r/8+10=0
We multiply all the terms by the denominator
r+10*8=0
We add all the numbers together, and all the variables
r+80=0
We move all terms containing r to the left, all other terms to the right
r=-80
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