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20n+16+9=57
We simplify the equation to the form, which is simple to understand
20n+16+9=57
We move all terms containing n to the left and all other terms to the right.
+20n=+57-16-9
We simplify left and right side of the equation.
+20n=+32
We divide both sides of the equation by 20 to get n.
n=1.6
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