Tìm x biết

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Bài 7: Tìm x biết:

1) \( (x+7)^2 - x(x-3) = 12 \)
2) \( (2x + 3)^2 - 4x^2 = 10 \)
3) \( (x + 2)^2 - x(x + 1) = 3 \)
4) \( 27x^2(x + 1)^2 - (3x + 1)^2 = -8 \)
5) \( (2x + 3)^2 - 4(x - 1)^2 = 10 \)
6) \( (x + 1)(x^2 - x + 1) - x(x^2 - 2) = 4 \)

7) \( (x - 2)^2 - (x + 1)(x + 3) = -7 \)
8) \( (x + 1)^2 - (x + 2)(x - 2) = 0 \)
9) \( (2x + 3)^2 - 4(x - 1)^2 = 16 \)
10) \( (x - 2)^2 - x(x - 5) - 3 = 0 \)
11) \( (3x - 2)(x + 9) - (3x - 2)^2 = 0 \)
12) \( x(4x + 1) - (3x - 2)^2 = -9 \)