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-(1+7k)=-1
We simplify the equation to the form, which is simple to understand
-(1+7k)=-1
Remove unnecessary parentheses
-1-7k=-1
We move all terms containing k to the left and all other terms to the right.
-7k=-1+1
We simplify left and right side of the equation.
-7k=0
We divide both sides of the equation by -7 to get k.
k=-0
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