An=12-3(n-1)

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Solution for An=12-3(n-1) equation: 


Simplifying
An = 12 + -3(n + -1)

Reorder the terms:
nA = 12 + -3(-1 + n)
nA = 12 + (-1 * -3 + n * -3)
nA = 12 + (3 + -3n)

Combine like terms: 12 + 3 = 15
nA = 15 + -3n

Solving
nA = 15 + -3n

Solving for variable 'n'.

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

Add '3n' to each side of the equation.
3n + nA = 15 + -3n + 3n

Combine like terms: -3n + 3n = 0
3n + nA = 15 + 0
3n + nA = 15

Reorder the terms:
-15 + 3n + nA = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 3n + nA = 0

The solution to this equation could not be determined.

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