(х-4)(х-3)-(х-6)(х+6)=7х x^2 - 3x -4x + 12 - (x^2 + 6x - 6x -36) = 7x x^2 - 7x + 12 - x^2 +36 = 7x 48 = 14x / : 14 x=24/7 ответ: 24/7