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x = 2
(x + 1)(x + 2)(x + 6) = x³ + 9x² + 4(7x - 1)
(x² + 3x + 2)(x+6) = x³ + 9x² + 28x - 4
x³ + 9x² + 20x + 12 = x³ + 9x² + 28x - 4
x³ + 9x² + 20x - x³ - 9x² - 28x = -4 - 12
-8x = -16
x = -16/-8
x=2