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56=8(k-90)
We move all terms to the left:
56-(8(k-90))=0
We calculate terms in parentheses: -(8(k-90)), so:We get rid of parentheses
8(k-90)
We multiply parentheses
8k-720
Back to the equation:
-(8k-720)
-8k+720+56=0
We add all the numbers together, and all the variables
-8k+776=0
We move all terms containing k to the left, all other terms to the right
-8k=-776
k=-776/-8
k=+97
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