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9k-8k+7k=56
We simplify the equation to the form, which is simple to understand
9k-8k+7k=56
We move all terms containing k to the left and all other terms to the right.
+9k-8k+7k=+56
We simplify left and right side of the equation.
+8k=+56
We divide both sides of the equation by 8 to get k.
k=7
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