{x-7/x+2 меньше 0 {-3/x+2 меньше 0

(3 + x) * (-7 + x) 2(3(-7 + x) + x(-7 + x)) = 0 2((-7 * 3 + x * 3) + x(-7 + x)) = 0 2((-21 + 3x) + x(-7 + x)) = 0 2(-21 + 3x + (-7 * x + x * x)) = 0 2(-21 + 3x + (-7x + x2)) = 0