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216=(r/2+214)
We move all terms to the left:
216-((r/2+214))=0
We multiply all the terms by the denominator
-((r+216*2+214))=0
We calculate terms in parentheses: -((r+216*2+214)), so:We get rid of parentheses
(r+216*2+214)
We add all the numbers together, and all the variables
(r+646)
We get rid of parentheses
r+646
Back to the equation:
-(r+646)
-r-646=0
We add all the numbers together, and all the variables
-1r-646=0
We move all terms containing r to the left, all other terms to the right
-r=646
r=646/-1
r=-646
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