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18n-12=159-20n
We simplify the equation to the form, which is simple to understand
18n-12=159-20n
We move all terms containing n to the left and all other terms to the right.
+18n+20n=+159+12
We simplify left and right side of the equation.
+38n=+171
We divide both sides of the equation by 38 to get n.
n=4.5
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