An=13+(n-1)4

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Solution for An=13+(n-1)4 equation:


Simplifying
An = 13 + (n + -1) * 4

Reorder the terms:
nA = 13 + (-1 + n) * 4

Reorder the terms for easier multiplication:
nA = 13 + 4(-1 + n)
nA = 13 + (-1 * 4 + n * 4)
nA = 13 + (-4 + 4n)

Combine like terms: 13 + -4 = 9
nA = 9 + 4n

Solving
nA = 9 + 4n

Solving for variable 'n'.

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

Add '-4n' to each side of the equation.
-4n + nA = 9 + 4n + -4n

Combine like terms: 4n + -4n = 0
-4n + nA = 9 + 0
-4n + nA = 9

Reorder the terms:
-9 + -4n + nA = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -4n + nA = 0

The solution to this equation could not be determined.

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