Tìm x, x^2 - x = 0

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1) \( x^2 - x = 0 \)
2) \( x^2 - 4x = 0 \)
3) \( x^2 + 3x = 0 \)
4) \( x + 5x^2 = 0 \)
5) \( x^2 - 7x = 0 \)
6) \( 3x^2 - 6x = 0 \)
7) \( x^2 + 7x = 0 \)
8) \( 7x^2 + 2x = 0 \)
9) \( x^2 + 6x = 0 \)
10) \( 2x^2 - 5x = 0 \)
11) \( 3x^2 + 7x = 0 \)
12) \( 5x - 3x^2 = 0 \)
13) \( 5x^2 - 13x = 0 \)
14) \( -3x^2 + 5x = 0 \)
15) \( 3x^2 - 7x = 0 \)