an=21-2n^2

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Solution for an=21-2n^2 equation: 


Simplifying
an = 21 + -2n2

Solving
an = 21 + -2n2

Solving for variable 'a'.

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

Divide each side by 'n'.
a = 21n-1 + -2n

Simplifying
a = 21n-1 + -2n

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