10y + (y - 5)(3y - 2) = (3 - y)(3y + 2)
10y + 3y² - 17y + 10 = 7y + 6 - 3y²
6y² - 14y + 4 = 0
3y² - 7y + 2 = 0
D = 49 - 24 = 25 = 5²
y₁ = (7 - 5)/6 = 1/3
y₂ = (7 + 5)/6 = 2
10y + (y - 5)(3y - 2) = (3 - y)(3y + 2)
10y + 3y² - 17y + 10 = 7y + 6 - 3y²
6y² - 14y + 4 = 0
3y² - 7y + 2 = 0
D = 49 - 24 = 25 = 5²
y₁ = (7 - 5)/6 = 1/3
y₂ = (7 + 5)/6 = 2