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-15=-8k+5-7k
We simplify the equation to the form, which is simple to understand
-15=-8k+5-7k
We move all terms containing k to the left and all other terms to the right.
+8k+7k=+5+15
We simplify left and right side of the equation.
+15k=+20
We divide both sides of the equation by 15 to get k.
k=1.33333333333
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