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