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n-12+3=0
We simplify the equation to the form, which is simple to understand
n-12+3=0
We move all terms containing n to the left and all other terms to the right.
+1n=0+12-3
We simplify left and right side of the equation.
+1n=+9
We divide both sides of the equation by 1 to get n.
n=9
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