To solve the equation (3^2-2^3)x + (2^5-5^2)x - 40 = 8^2, we can simplify the terms on both sides of the equation.

Starting with the left side:
(3^2-2^3)x + (2^5-5^2)x - 40
(9-8)x + (32-25)x - 40
x + 7x - 40

Simplifying further:
8x - 40

Now let's simplify the right side of the equation:
8^2
64

So the equation becomes:
8x - 40 = 64

To solve for x, we can add 40 to both sides of the equation:
8x - 40 + 40 = 64 + 40
8x = 104

Finally, divide both sides of the equation by 8 to solve for x:
8x/8 = 104/8
x = 13

Therefore, the solution to the equation is x = 13.