Здравствуйте,помогите решить задание по алгебре

Решите неравенства методом интервалов:

а) |7 - x| (x² - 25) (x - 1)³ < 0

б)[tex]\frac{3x+4}{2x-4}[/tex]≥[tex]\frac{1}{4}[/tex]
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