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-90=6(2k+1)
We move all terms to the left:
-90-(6(2k+1))=0
We calculate terms in parentheses: -(6(2k+1)), so:We get rid of parentheses
6(2k+1)
We multiply parentheses
12k+6
Back to the equation:
-(12k+6)
-12k-6-90=0
We add all the numbers together, and all the variables
-12k-96=0
We move all terms containing k to the left, all other terms to the right
-12k=96
k=96/-12
k=-8
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