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4k+5k=9
We simplify the equation to the form, which is simple to understand
4k+5k=9
We move all terms containing k to the left and all other terms to the right.
+4k+5k=+9
We simplify left and right side of the equation.
+9k=+9
We divide both sides of the equation by 9 to get k.
k=1
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