an=-15+5(n-1)

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Solution for an=-15+5(n-1) equation: 


Simplifying
an = -15 + 5(n + -1)

Reorder the terms:
an = -15 + 5(-1 + n)
an = -15 + (-1 * 5 + n * 5)
an = -15 + (-5 + 5n)

Combine like terms: -15 + -5 = -20
an = -20 + 5n

Solving
an = -20 + 5n

Solving for variable 'a'.

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

Divide each side by 'n'.
a = -20n-1 + 5

Simplifying
a = -20n-1 + 5

Reorder the terms:
a = 5 + -20n-1

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