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80-5k=2k+40
We simplify the equation to the form, which is simple to understand
80-5k=2k+40
We move all terms containing k to the left and all other terms to the right.
-5k-2k=+40-80
We simplify left and right side of the equation.
-7k=-40
We divide both sides of the equation by -7 to get k.
k=5.71428571429
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