To solve the equation x/15 = 3/5 + (-2)/3, we need to find a common denominator for the fractions on the right side.

The common denominator for 5 and 3 is 15, so we can rewrite the equation as:

x/15 = (3/5)(3/3) + (-2/3)(5/5)

Simplifying, we get:

x/15 = 9/15 + (-10/15)

Combining the fractions, we have:

x/15 = (-1/15)

To isolate x, we can multiply both sides of the equation by 15:

15 * (x/15) = 15 * (-1/15)

This simplifies to:

x = -1