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-40+3k=k-6k
We simplify the equation to the form, which is simple to understand
-40+3k=k-6k
We move all terms containing k to the left and all other terms to the right.
+3k-1k+6k=+40
We simplify left and right side of the equation.
+8k=+40
We divide both sides of the equation by 8 to get k.
k=5
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