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-20k+10k+9k=-8
We simplify the equation to the form, which is simple to understand
-20k+10k+9k=-8
We move all terms containing k to the left and all other terms to the right.
-20k+10k+9k=-8
We simplify left and right side of the equation.
-1k=-8
We divide both sides of the equation by -1 to get k.
k=8
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