For the function f(x) = (-2(2(1cos(3π(-3x - 1) + 1) - 1)^2 - 3) - 1)/(-3(2(1cos(3π(-3x - 1) + 1) - 1)^2 - 3) - 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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