To solve the equation 15 + ax5 = 10 for x, we need to isolate the variable x on one side of the equation. We can do this by subtracting 15 from both sides of the equation, which gives us ax5 = -5. Then, we can divide both sides of the equation by a to get x5 = -5/a. Finally, we can take the fifth root of both sides of the equation to isolate x, which gives us x = (-5/a)^(1/5).
Therefore, the solution to the equation is x = (-5/a)^(1/5). Note that this solution assumes that a is not equal to 0, as dividing by 0 is undefined