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-12=3-3k-2k
We simplify the equation to the form, which is simple to understand
-12=3-3k-2k
We move all terms containing k to the left and all other terms to the right.
+3k+2k=+3+12
We simplify left and right side of the equation.
+5k=+15
We divide both sides of the equation by 5 to get k.
k=3
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