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1-3k=-9-k
We simplify the equation to the form, which is simple to understand
1-3k=-9-k
We move all terms containing k to the left and all other terms to the right.
-3k+1k=-9-1
We simplify left and right side of the equation.
-2k=-10
We divide both sides of the equation by -2 to get k.
k=5
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