an=1+(n-1)-3

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Solution for an=1+(n-1)-3 equation: 


Simplifying
an = 1 + (n + -1) + -3

Reorder the terms:
an = 1 + (-1 + n) + -3

Remove parenthesis around (-1 + n)
an = 1 + -1 + n + -3

Reorder the terms:
an = 1 + -1 + -3 + n

Combine like terms: 1 + -1 = 0
an = 0 + -3 + n
an = -3 + n

Solving
an = -3 + n

Solving for variable 'a'.

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

Divide each side by 'n'.
a = -3n-1 + 1

Simplifying
a = -3n-1 + 1

Reorder the terms:
a = 1 + -3n-1

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