Answer:
There is no equals sign in that expression so it is not actually an equation and has no solution.
If you are looking to expand the two polynomials, then you get:
(x² - x + 5)(x - 3)
= x(x² - x + 5) - 3(x² - x + 5)
= x³ - x² + 5x - 3x² + 3x - 15
= x³ - 4x² + 8x - 15
