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5n+3+4n=39
We simplify the equation to the form, which is simple to understand
5n+3+4n=39
We move all terms containing n to the left and all other terms to the right.
+5n+4n=+39-3
We simplify left and right side of the equation.
+9n=+36
We divide both sides of the equation by 9 to get n.
n=4
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