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-4k+5=-21
We simplify the equation to the form, which is simple to understand
-4k+5=-21
We move all terms containing k to the left and all other terms to the right.
-4k=-21-5
We simplify left and right side of the equation.
-4k=-26
We divide both sides of the equation by -4 to get k.
k=6.5
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