n+n+1+n-1=57

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Solution for n+n+1+n-1=57 equation: 


Simplifying
n + n + 1 + n + -1 = 57

Reorder the terms:
1 + -1 + n + n + n = 57

Combine like terms: 1 + -1 = 0
0 + n + n + n = 57
n + n + n = 57

Combine like terms: n + n = 2n
2n + n = 57

Combine like terms: 2n + n = 3n
3n = 57

Solving
3n = 57

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Divide each side by '3'.
n = 19

Simplifying
n = 19

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