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9n+8-20n=-40-19n-17+13n
We simplify the equation to the form, which is simple to understand
9n+8-20n=-40-19n-17+13n
We move all terms containing n to the left and all other terms to the right.
+9n-20n+19n-13n=-40-17-8
We simplify left and right side of the equation.
-5n=-65
We divide both sides of the equation by -5 to get n.
n=13
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