Павел Сметанин (5х-3)(5х+3)=4х (3х+2) 25х^2 - 9 = 12x^2 + 8x 25x^2 - 12x^2 - 8x - 9 = 0 13x^2 - 9x - 9 = 0 a = 13, b = -9, c = -9 D = b^2 - 4ac = 169 - 4*(-9)*(-9) = 169 - 324 Корней нет. PS: ^2 - квадрат