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94=r+2(6r-5)
We move all terms to the left:
94-(r+2(6r-5))=0
We calculate terms in parentheses: -(r+2(6r-5)), so:We get rid of parentheses
r+2(6r-5)
We multiply parentheses
r+12r-10
We add all the numbers together, and all the variables
13r-10
Back to the equation:
-(13r-10)
-13r+10+94=0
We add all the numbers together, and all the variables
-13r+104=0
We move all terms containing r to the left, all other terms to the right
-13r=-104
r=-104/-13
r=+8
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