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80=5(k+13)
We move all terms to the left:
80-(5(k+13))=0
We calculate terms in parentheses: -(5(k+13)), so:We get rid of parentheses
5(k+13)
We multiply parentheses
5k+65
Back to the equation:
-(5k+65)
-5k-65+80=0
We add all the numbers together, and all the variables
-5k+15=0
We move all terms containing k to the left, all other terms to the right
-5k=-15
k=-15/-5
k=+3
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