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118=-2(-3-7r)
We move all terms to the left:
118-(-2(-3-7r))=0
We add all the numbers together, and all the variables
-(-2(-7r-3))+118=0
We calculate terms in parentheses: -(-2(-7r-3)), so:We get rid of parentheses
-2(-7r-3)
We multiply parentheses
14r+6
Back to the equation:
-(14r+6)
-14r-6+118=0
We add all the numbers together, and all the variables
-14r+112=0
We move all terms containing r to the left, all other terms to the right
-14r=-112
r=-112/-14
r=+8
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