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84=-6(r-2)-6r
We move all terms to the left:
84-(-6(r-2)-6r)=0
We calculate terms in parentheses: -(-6(r-2)-6r), so:We get rid of parentheses
-6(r-2)-6r
We add all the numbers together, and all the variables
-6r-6(r-2)
We multiply parentheses
-6r-6r+12
We add all the numbers together, and all the variables
-12r+12
Back to the equation:
-(-12r+12)
12r-12+84=0
We add all the numbers together, and all the variables
12r+72=0
We move all terms containing r to the left, all other terms to the right
12r=-72
r=-72/12
r=-6
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