10x² - (2x-3) (5x-1) = 31 помогите)

10 х^2 - (2 х - 3) (5 х - 1) = 31

(2 х - 3) (5 х - 1) = 10 х^2 - 2 х - 15 х + 3 = 10 х^2 - 17 х + 3

10 х^2 - (10 х^2 - 17 х + 3) = 31

10 х^2 - 10 х^2 + 17 х - 3 = 31

17 х - 3 = 31

17 х = 34

Х = 2