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103=8k-7(8k-1)
We move all terms to the left:
103-(8k-7(8k-1))=0
We calculate terms in parentheses: -(8k-7(8k-1)), so:We get rid of parentheses
8k-7(8k-1)
We multiply parentheses
8k-56k+7
We add all the numbers together, and all the variables
-48k+7
Back to the equation:
-(-48k+7)
48k-7+103=0
We add all the numbers together, and all the variables
48k+96=0
We move all terms containing k to the left, all other terms to the right
48k=-96
k=-96/48
k=-2
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