An=7-3.2(n-1)

Solution for An=7-3.2(n-1) equation:

Simplifying
An = 7 + -3.2(n + -1)

Reorder the terms:
nA = 7 + -3.2(-1 + n)
nA = 7 + (-1 * -3.2 + n * -3.2)
nA = 7 + (3.2 + -3.2n)

Combine like terms: 7 + 3.2 = 10.2
nA = 10.2 + -3.2n

Solving
nA = 10.2 + -3.2n

Solving for variable 'n'.

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

Add '3.2n' to each side of the equation.
3.2n + nA = 10.2 + -3.2n + 3.2n

Combine like terms: -3.2n + 3.2n = 0.0
3.2n + nA = 10.2 + 0.0
3.2n + nA = 10.2

Reorder the terms:
-10.2 + 3.2n + nA = 10.2 + -10.2

Combine like terms: 10.2 + -10.2 = 0.0
-10.2 + 3.2n + nA = 0.0

The solution to this equation could not be determined.