Tìm x, biết: \( 5(2x - 5) = x(2x - 5) \)

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**Bài 6. Tìm x, biết:**
a) \( 5(2x - 5) = x(2x - 5) \)
d) \( (2x - 3)^2 - 49 = 0 \)
h) \( x^2 - 25 - (x + 5) = 0 \)

**Bài 7. Tìm x, biết:**
b) \( (x + 2)(x + 3) - (x - 2)(x + 5) = 6 \)
e) \( x(2x - 3) - 2(x - 1)(x + 1) + 4x = 0 \)
i) \( (2x - 1)^2 - (4x - 1) = 0 \)
c) \( (2x - 1)^2 = (x - 1)^2 \)
g) \( 3x(x - 2) - x + 2 = 0 \)
k) \( (3x - 1)^2 - (x + 5)^2 = 0 \)