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-2k+2k-7k-2k=18
We simplify the equation to the form, which is simple to understand
-2k+2k-7k-2k=18
We move all terms containing k to the left and all other terms to the right.
-2k+2k-7k-2k=+18
We simplify left and right side of the equation.
-9k=+18
We divide both sides of the equation by -9 to get k.
k=-2
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