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