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21n-12=24n-24
We simplify the equation to the form, which is simple to understand
21n-12=24n-24
We move all terms containing n to the left and all other terms to the right.
+21n-24n=-24+12
We simplify left and right side of the equation.
-3n=-12
We divide both sides of the equation by -3 to get n.
n=4
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