Какое из уравнений не имеет решений?
[tex]x {}^{2} + 9 = 0[/tex]
[tex]5x {}^{2} = 5x {}^{2} [/tex]
[tex]2x {}^{2} - x = x[/tex]
[tex]x - 1 = 0[/tex]
[tex]x { - x}^{2} = - 4[/tex]

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