(7-2x)(x-3) + 2x^2 = 57x - 21 - 2x^2 + 6x + 2x^2 = 57x - 21 + 6x = 513x - 21 = 513x = 26x = 2
Ответ: x = 2
(7-2x)(x-3) + 2x^2 = 5
7x - 21 - 2x^2 + 6x + 2x^2 = 5
7x - 21 + 6x = 5
13x - 21 = 5
13x = 26
x = 2
Ответ: x = 2