For the function f(x) = -1|(-1cos(2π((-3(5x - 1) - 1)/(3(5x - 1) - 2)) + 3)) + 2| - 3, 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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