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90=6(-1-2k)
We move all terms to the left:
90-(6(-1-2k))=0
We add all the numbers together, and all the variables
-(6(-2k-1))+90=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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