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-66=6k+6(k+1)
We move all terms to the left:
-66-(6k+6(k+1))=0
We calculate terms in parentheses: -(6k+6(k+1)), so:We get rid of parentheses
6k+6(k+1)
We multiply parentheses
6k+6k+6
We add all the numbers together, and all the variables
12k+6
Back to the equation:
-(12k+6)
-12k-6-66=0
We add all the numbers together, and all the variables
-12k-72=0
We move all terms containing k to the left, all other terms to the right
-12k=72
k=72/-12
k=-6
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