an=an-1-an-2

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Solution for an=an-1-an-2 equation: 


Simplifying
an = an + -1 + -1an + -2

Reorder the terms:
an = -1 + -2 + an + -1an

Combine like terms: -1 + -2 = -3
an = -3 + an + -1an

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

Solving
an = -3

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

Simplifying
a = -3n-1

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