Rozwiąż równanie:
1. (x + 9)^2 - 2x = x(x +6) - 19
2. x(x - 6) + 26 = (3x + 4)^2 - 8x^2
3. (6 - 0.5x)^2 - 3 = 0.5(0.5x^2 - 6)
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