An=15+3(n-1)

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Solution for An=15+3(n-1) equation: 


Simplifying
An = 15 + 3(n + -1)

Reorder the terms:
nA = 15 + 3(-1 + n)
nA = 15 + (-1 * 3 + n * 3)
nA = 15 + (-3 + 3n)

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

Solving
nA = 12 + 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 = 12 + 3n + -3n

Combine like terms: 3n + -3n = 0
-3n + nA = 12 + 0
-3n + nA = 12

Reorder the terms:
-12 + -3n + nA = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + -3n + nA = 0

The solution to this equation could not be determined.

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