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2(r-93)=-86
We move all terms to the left:
2(r-93)-(-86)=0
We add all the numbers together, and all the variables
2(r-93)+86=0
We multiply parentheses
2r-186+86=0
We add all the numbers together, and all the variables
2r-100=0
We move all terms containing r to the left, all other terms to the right
2r=100
r=100/2
r=50
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