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7(3+9k)=-16
We simplify the equation to the form, which is simple to understand
7(3+9k)=-16
Reorder the terms in parentheses
+(+21+63k)=-16
Remove unnecessary parentheses
+21+63k=-16
We move all terms containing k to the left and all other terms to the right.
+63k=-16-21
We simplify left and right side of the equation.
+63k=-37
We divide both sides of the equation by 63 to get k.
k=-0.587301587302
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