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12-8n-n+4=-56
We simplify the equation to the form, which is simple to understand
12-8n-n+4=-56
We move all terms containing n to the left and all other terms to the right.
-8n-1n=-56-12-4
We simplify left and right side of the equation.
-9n=-72
We divide both sides of the equation by -9 to get n.
n=8
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