an=20(n-1)

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Solution for an=20(n-1) equation: 


Simplifying
an = 20(n + -1)

Reorder the terms:
an = 20(-1 + n)
an = (-1 * 20 + n * 20)
an = (-20 + 20n)

Solving
an = -20 + 20n

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 + 20

Simplifying
a = -20n-1 + 20

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

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