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3-3n=-12+2n
We simplify the equation to the form, which is simple to understand
3-3n=-12+2n
We move all terms containing n to the left and all other terms to the right.
-3n-2n=-12-3
We simplify left and right side of the equation.
-5n=-15
We divide both sides of the equation by -5 to get n.
n=3
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