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-90=5(3k+6)
We simplify the equation to the form, which is simple to understand
-90=5(3k+6)
Reorder the terms in parentheses
-90=+(+15k+30)
Remove unnecessary parentheses
-90=+15k+30
We move all terms containing k to the left and all other terms to the right.
-15k=+30+90
We simplify left and right side of the equation.
-15k=+120
We divide both sides of the equation by -015 to get k.
k=-8
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