13. Решите уравнение: а)(2x – 1)(2x +1) + х(х - 1) = 2х(х + 1)

б)(3х + 1)^2 - х(7х + 5) = 4

в) (3х - 1)(3х + 1) – 2х(1 + 4x) = -2

г) (2x + 1)^2 + 2 = 2 – 6х^2
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