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-4k-5(7k+7)=0
We simplify the equation to the form, which is simple to understand
-4k-5(7k+7)=0
Reorder the terms in parentheses
-4k+(-35k-35)=0
Remove unnecessary parentheses
-4k-35k-35=0
We move all terms containing k to the left and all other terms to the right.
-4k-35k=0+35
We simplify left and right side of the equation.
-39k=+35
We divide both sides of the equation by -39 to get k.
k=-0.897435897436
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