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108=7(7-8r)-3r
We move all terms to the left:
108-(7(7-8r)-3r)=0
We add all the numbers together, and all the variables
-(7(-8r+7)-3r)+108=0
We calculate terms in parentheses: -(7(-8r+7)-3r), so:We get rid of parentheses
7(-8r+7)-3r
We add all the numbers together, and all the variables
-3r+7(-8r+7)
We multiply parentheses
-3r-56r+49
We add all the numbers together, and all the variables
-59r+49
Back to the equation:
-(-59r+49)
59r-49+108=0
We add all the numbers together, and all the variables
59r+59=0
We move all terms containing r to the left, all other terms to the right
59r=-59
r=-59/59
r=-1
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