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20.00-k=12.50
We simplify the equation to the form, which is simple to understand
20.00-k=12.50
We move all terms containing k to the left and all other terms to the right.
-1k=+12.5-20
We simplify left and right side of the equation.
-1k=-7.5
We divide both sides of the equation by -1 to get k.
k=7.5
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