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-15=4n+9-6n
We simplify the equation to the form, which is simple to understand
-15=4n+9-6n
We move all terms containing n to the left and all other terms to the right.
-4n+6n=+9+15
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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