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