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-15=-12n+9
We simplify the equation to the form, which is simple to understand
-15=-12n+9
We move all terms containing n to the left and all other terms to the right.
+12n=+9+15
We simplify left and right side of the equation.
+12n=+24
We divide both sides of the equation by 012 to get n.
n=2
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