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7(1+8k)=-49
We simplify the equation to the form, which is simple to understand
7(1+8k)=-49
Reorder the terms in parentheses
+(+7+56k)=-49
Remove unnecessary parentheses
+7+56k=-49
We move all terms containing k to the left and all other terms to the right.
+56k=-49-7
We simplify left and right side of the equation.
+56k=-56
We divide both sides of the equation by 56 to get k.
k=-1
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