20 БАЛЛОВ!
Решить уравнения методом замены переменной
[tex] x^{2} -2x-3- \frac{30}{ x^{2} -2x-2} =0[/tex]

[tex]( x^{2} +2x) ^{2}-( x^{2} +2x)-6= 0[/tex]
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