800=A*(1-.25)

Solution for 800=A*(1-.25) equation:

Simplifying
800 = A(1 + -0.25)

Combine like terms: 1 + -0.25 = 0.75
800 = A(0.75)

Reorder the terms for easier multiplication:
800 = 0.75A

Solving
800 = 0.75A

Solving for variable 'A'.

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

Add '-0.75A' to each side of the equation.
800 + -0.75A = 0.75A + -0.75A

Combine like terms: 0.75A + -0.75A = 0.00
800 + -0.75A = 0.00

Add '-800' to each side of the equation.
800 + -800 + -0.75A = 0.00 + -800

Combine like terms: 800 + -800 = 0
0 + -0.75A = 0.00 + -800
-0.75A = 0.00 + -800

Combine like terms: 0.00 + -800 = -800
-0.75A = -800

Divide each side by '-0.75'.
A = 1066.666667

Simplifying
A = 1066.666667