an=15+3(n-3)

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


Simplifying
an = 15 + 3(n + -3)

Reorder the terms:
an = 15 + 3(-3 + n)
an = 15 + (-3 * 3 + n * 3)
an = 15 + (-9 + 3n)

Combine like terms: 15 + -9 = 6
an = 6 + 3n

Solving
an = 6 + 3n

Solving for variable 'a'.

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

Divide each side by 'n'.
a = 6n-1 + 3

Simplifying
a = 6n-1 + 3

Reorder the terms:
a = 3 + 6n-1

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