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9/3+12n/3=0
We simplify the equation to the form, which is simple to understand
9/3+12n/3=0
We move all terms containing n to the left and all other terms to the right.
+4n=0-3
We simplify left and right side of the equation.
+4n=-3
We divide both sides of the equation by 4 to get n.
n=-0.75
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