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8k+3k-9k=0
We simplify the equation to the form, which is simple to understand
8k+3k-9k=0
We move all terms containing k to the left and all other terms to the right.
+8k+3k-9k=0
We simplify left and right side of the equation.
+2k=0
We divide both sides of the equation by 2 to get k.
k=0
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