Tìm x, biết

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Bài 4: Tìm x, biết
a) \( 3(2x - 1) - 5(x - 3) + 6(3x - 4) = 24 \)
b) \( 5x^2 - 3(x - 1)(x + 2) = 2x(x + 1) \)
c) \( 2x( x - 5) - x(2x + 3) = 26 \).
d) \( 2x^2 + 3(x^2 - 1) = 5x(x + 1) \)

e) \( (10x + 9)x - (5x - 1)(2x + 3) = 8 \).
f) \( (3x - 5)(7 - 5x) + (5x + 2)(3x - 2) = 3 \)