For the function f(x) = 2cos(3π(-1|((3(-3x^2 + 3x + 4) + 3)/(-1(-3x^2 + 3x + 4) + 3)) - 2| + 3) + 2) - 1, find the number of maximal connected intervals in [-10, 10] where f'(x) < 0.

Present the answer in LaTex format: \boxed{Your answer}
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