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-40-8k=-8(2k-2)
We move all terms to the left:
-40-8k-(-8(2k-2))=0
We calculate terms in parentheses: -(-8(2k-2)), so:We get rid of parentheses
-8(2k-2)
We multiply parentheses
-16k+16
Back to the equation:
-(-16k+16)
-8k+16k-16-40=0
We add all the numbers together, and all the variables
8k-56=0
We move all terms containing k to the left, all other terms to the right
8k=56
k=56/8
k=7
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