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-k=-9-k
We simplify the equation to the form, which is simple to understand
-k=-9-k
We move all terms containing k to the left and all other terms to the right.
-1k+1k=-9
We simplify left and right side of the equation.
k=-9
0=-9
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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