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3 + 12x - 12 < 5x + 6x + 3
12x - 9 < 11x + 3
12x - 11x < 3 + 9
x < 12
b. 3x (6 - x) - 9 < 15x - x (3x - 2)
18x - 3x² - 9 < 15x - 3x² + 2x
18x - 15x - 2x - 3x² + 3x² - 9< 0
x - 9 < 0
x < 9
c. x(x - 3) - 4(x - 2) > x² - 2(4x - 1)
x² - 3x - 4x + 8 > x² - 8x + 2
x² - x² - 7x + 8x > 2 - 8
x > -6