(x2 + 2x - 5x - 10) - (x2 + 6x + 9) ≥ 7 - 14x
x2 - 3x - 10 - x2 - 6x - 9 ≥ 7 - 14x
-9x - 19 ≥ 7 - 14x
5x ≥ 26
x ≥ 26/5