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n+1+n+2+n+3=57
We simplify the equation to the form, which is simple to understand
n+1+n+2+n+3=57
We move all terms containing n to the left and all other terms to the right.
+1n+1n+1n=+57-1-2-3
We simplify left and right side of the equation.
+3n=+51
We divide both sides of the equation by 3 to get n.
n=17
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