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9+4n=-15+2n
We simplify the equation to the form, which is simple to understand
9+4n=-15+2n
We move all terms containing n to the left and all other terms to the right.
+4n-2n=-15-9
We simplify left and right side of the equation.
+2n=-24
We divide both sides of the equation by 2 to get n.
n=-12
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