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-24=-3(k-72)
We move all terms to the left:
-24-(-3(k-72))=0
We calculate terms in parentheses: -(-3(k-72)), so:We get rid of parentheses
-3(k-72)
We multiply parentheses
-3k+216
Back to the equation:
-(-3k+216)
3k-216-24=0
We add all the numbers together, and all the variables
3k-240=0
We move all terms containing k to the left, all other terms to the right
3k=240
k=240/3
k=80
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