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8+7+5+2+6+4+7+4+n+5=81
We simplify the equation to the form, which is simple to understand
8+7+5+2+6+4+7+4+n+5=81
We move all terms containing n to the left and all other terms to the right.
+1n=+81-8-7-5-2-6-4-7-4-5
We simplify left and right side of the equation.
+1n=+33
We divide both sides of the equation by 1 to get n.
n=33
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