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28-1k=7(k-4)
We move all terms to the left:
28-1k-(7(k-4))=0
We calculate terms in parentheses: -(7(k-4)), so:We get rid of parentheses
7(k-4)
We multiply parentheses
7k-28
Back to the equation:
-(7k-28)
-1k-7k+28+28=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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