A(n)=4+(n-1)(5)

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

Simplifying
A(n) = 4 + (n + -1)(5)

Multiply A * n
nA = 4 + (n + -1)(5)

Reorder the terms:
nA = 4 + (-1 + n)(5)

Reorder the terms for easier multiplication:
nA = 4 + 5(-1 + n)
nA = 4 + (-1 * 5 + n * 5)
nA = 4 + (-5 + 5n)

Combine like terms: 4 + -5 = -1
nA = -1 + 5n

Solving
nA = -1 + 5n

Solving for variable 'n'.

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

Add '-5n' to each side of the equation.
-5n + nA = -1 + 5n + -5n

Combine like terms: 5n + -5n = 0
-5n + nA = -1 + 0
-5n + nA = -1

Reorder the terms:
1 + -5n + nA = -1 + 1

Combine like terms: -1 + 1 = 0
1 + -5n + nA = 0

The solution to this equation could not be determined.