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-12=3(1+k)
We simplify the equation to the form, which is simple to understand
-12=3(1+k)
Reorder the terms in parentheses
-12=+(+3+3k)
Remove unnecessary parentheses
-12=+3+3k
We move all terms containing k to the left and all other terms to the right.
-3k=+3+12
We simplify left and right side of the equation.
-3k=+15
We divide both sides of the equation by -03 to get k.
k=-5
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