(x + 9)/(x - 7) < 1
(x + 9)/(x - 7) - 1 < 0
(x + 9 - x + 7)/(x - 7) < 0
16/(x - 7) < 0
x < 7
(9x + 9)/(6x -5) > -1
(9x + 9)/(6x -5) + 1 > 0
(9x + 9 + 6x - 5)/(6x - 5) > 0
(15x + 4)/(6x - 5) > 0
++++++(-4/15) --------- (5/6) +++++++
x∈(-∞, -4/15) U (5/6, +∞)
пересекаем с 1
x∈(-∞, -4/15) U (5/6, +7)
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Verified answer
(x + 9)/(x - 7) < 1
(x + 9)/(x - 7) - 1 < 0
(x + 9 - x + 7)/(x - 7) < 0
16/(x - 7) < 0
x < 7
(9x + 9)/(6x -5) > -1
(9x + 9)/(6x -5) + 1 > 0
(9x + 9 + 6x - 5)/(6x - 5) > 0
(15x + 4)/(6x - 5) > 0
++++++(-4/15) --------- (5/6) +++++++
x∈(-∞, -4/15) U (5/6, +∞)
пересекаем с 1
x∈(-∞, -4/15) U (5/6, +7)