An=An-3

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Solution for An=An-3 equation: 


Simplifying
An = An + -3

Reorder the terms:
nA = -3 + nA

Add '-1nA' to each side of the equation.
nA + -1nA = -3 + nA + -1nA

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

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

Solving
0 = -3

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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