an=an-1-4

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Solution for an=an-1-4 equation: 


Simplifying
an = an + -1 + -4

Reorder the terms:
an = -1 + -4 + an

Combine like terms: -1 + -4 = -5
an = -5 + an

Add '-1an' to each side of the equation.
an + -1an = -5 + an + -1an

Combine like terms: an + -1an = 0
0 = -5 + an + -1an

Combine like terms: an + -1an = 0
0 = -5 + 0
0 = -5

Solving
0 = -5

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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