an=3+(n-1)(8)

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Solution for an=3+(n-1)(8) equation: 


Simplifying
an = 3 + (n + -1)(8)

Reorder the terms:
an = 3 + (-1 + n)(8)

Reorder the terms for easier multiplication:
an = 3 + 8(-1 + n)
an = 3 + (-1 * 8 + n * 8)
an = 3 + (-8 + 8n)

Combine like terms: 3 + -8 = -5
an = -5 + 8n

Solving
an = -5 + 8n

Solving for variable 'a'.

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

Divide each side by 'n'.
a = -5n-1 + 8

Simplifying
a = -5n-1 + 8

Reorder the terms:
a = 8 + -5n-1

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