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-5x² + 5x + 7x - 7 < 0
(-5x² + 5x) + (7x - 7) < 0
-5x (x - 1) + 7 (x - 1) < 0
(-5x + 7) (x - 1) < 0
-5x + 7 < 0 dan x - 1 < 0
-5x < -7 x < 1
5x > 7
x > 7/5
Himpunan penyelesaian: x < 1 dan x > 7/5