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10=5(k-81)
We move all terms to the left:
10-(5(k-81))=0
We calculate terms in parentheses: -(5(k-81)), so:We get rid of parentheses
5(k-81)
We multiply parentheses
5k-405
Back to the equation:
-(5k-405)
-5k+405+10=0
We add all the numbers together, and all the variables
-5k+415=0
We move all terms containing k to the left, all other terms to the right
-5k=-415
k=-415/-5
k=+83
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