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-7k-1=-7k
We simplify the equation to the form, which is simple to understand
-7k-1=-7k
We move all terms containing k to the left and all other terms to the right.
-7k+7k=+1
We simplify left and right side of the equation.
k=+1
0=01
The left and right sides are not equal, therefore there is no solution. This equation is invalid.
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