an=-9+(-7)(n-1)

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Solution for an=-9+(-7)(n-1) equation: 


Simplifying
an = -9 + (-7)(n + -1)

Reorder the terms:
an = -9 + -7(-1 + n)
an = -9 + (-1 * -7 + n * -7)
an = -9 + (7 + -7n)

Combine like terms: -9 + 7 = -2
an = -2 + -7n

Solving
an = -2 + -7n

Solving for variable 'a'.

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

Divide each side by 'n'.
a = -2n-1 + -7

Simplifying
a = -2n-1 + -7

Reorder the terms:
a = -7 + -2n-1

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