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n--4-9=0
We simplify the equation to the form, which is simple to understand
n+4-9=0
We move all terms containing n to the left and all other terms to the right.
+1n=0-4+9
We simplify left and right side of the equation.
+1n=+5
We divide both sides of the equation by 1 to get n.
n=5
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