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68=3(6r-)-7(1-3r)
We move all terms to the left:
68-(3(6r-)-7(1-3r))=0
We add all the numbers together, and all the variables
-(3(+6r)-7(-3r+1))+68=0
We calculate terms in parentheses: -(3(+6r)-7(-3r+1)), so:We get rid of parentheses
3(+6r)-7(-3r+1)
We multiply parentheses
18r+21r-7
We add all the numbers together, and all the variables
39r-7
Back to the equation:
-(39r-7)
-39r+7+68=0
We add all the numbers together, and all the variables
-39r+75=0
We move all terms containing r to the left, all other terms to the right
-39r=-75
r=-75/-39
r=1+12/13
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