an=100+(-20)(n-1)

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Solution for an=100+(-20)(n-1) equation: 


Simplifying
an = 100 + (-20)(n + -1)

Reorder the terms:
an = 100 + -20(-1 + n)
an = 100 + (-1 * -20 + n * -20)
an = 100 + (20 + -20n)

Combine like terms: 100 + 20 = 120
an = 120 + -20n

Solving
an = 120 + -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 = 120n-1 + -20

Simplifying
a = 120n-1 + -20

Reorder the terms:
a = -20 + 120n-1

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