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9=13n-7-5n
We simplify the equation to the form, which is simple to understand
9=13n-7-5n
We move all terms containing n to the left and all other terms to the right.
-13n+5n=-7-9
We simplify left and right side of the equation.
-8n=-16
We divide both sides of the equation by -8 to get n.
n=2
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