an=-15+(n-1)(4)

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Solution for an=-15+(n-1)(4) equation: 


Simplifying
an = -15 + (n + -1)(4)

Reorder the terms:
an = -15 + (-1 + n)(4)

Reorder the terms for easier multiplication:
an = -15 + 4(-1 + n)
an = -15 + (-1 * 4 + n * 4)
an = -15 + (-4 + 4n)

Combine like terms: -15 + -4 = -19
an = -19 + 4n

Solving
an = -19 + 4n

Solving for variable 'a'.

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

Divide each side by 'n'.
a = -19n-1 + 4

Simplifying
a = -19n-1 + 4

Reorder the terms:
a = 4 + -19n-1

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