an-2+7n=20

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Solution for an-2+7n=20 equation:


Simplifying
an + -2 + 7n = 20

Reorder the terms:
-2 + an + 7n = 20

Solving
-2 + an + 7n = 20

Solving for variable 'a'.

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

Add '2' to each side of the equation.
-2 + an + 2 + 7n = 20 + 2

Reorder the terms:
-2 + 2 + an + 7n = 20 + 2

Combine like terms: -2 + 2 = 0
0 + an + 7n = 20 + 2
an + 7n = 20 + 2

Combine like terms: 20 + 2 = 22
an + 7n = 22

Add '-7n' to each side of the equation.
an + 7n + -7n = 22 + -7n

Combine like terms: 7n + -7n = 0
an + 0 = 22 + -7n
an = 22 + -7n

Divide each side by 'n'.
a = 22n-1 + -7

Simplifying
a = 22n-1 + -7

Reorder the terms:
a = -7 + 22n-1

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