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15=5(k-5)
We move all terms to the left:
15-(5(k-5))=0
We calculate terms in parentheses: -(5(k-5)), so:We get rid of parentheses
5(k-5)
We multiply parentheses
5k-25
Back to the equation:
-(5k-25)
-5k+25+15=0
We add all the numbers together, and all the variables
-5k+40=0
We move all terms containing k to the left, all other terms to the right
-5k=-40
k=-40/-5
k=+8
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