an=-9-7n

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Solution for an=-9-7n equation: 


Simplifying
an = -9 + -7n

Solving
an = -9 + -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 = -9n-1 + -7

Simplifying
a = -9n-1 + -7

Reorder the terms:
a = -7 + -9n-1

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