an=4(5)n+-1

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Solution for an=4(5)n+-1 equation: 


Simplifying
an = 4(5) * n + -1

Multiply 4 * 5
an = 20n + -1

Reorder the terms:
an = -1 + 20n

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

Simplifying
a = -1n-1 + 20

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

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