For the function f(x) = 2(-1cos(2π(-4((-1x)/(-2x + 3)) + 4) - 3) + 3)^2 - 5(-1cos(2π(-4((-1x)/(-2x + 3)) + 4) - 3) + 3) + 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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