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86=2(1-7r)
We move all terms to the left:
86-(2(1-7r))=0
We add all the numbers together, and all the variables
-(2(-7r+1))+86=0
We calculate terms in parentheses: -(2(-7r+1)), so:We get rid of parentheses
2(-7r+1)
We multiply parentheses
-14r+2
Back to the equation:
-(-14r+2)
14r-2+86=0
We add all the numbers together, and all the variables
14r+84=0
We move all terms containing r to the left, all other terms to the right
14r=-84
r=-84/14
r=-6
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