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[tex]Rezolvati in multimea numerelor intregi Ecuatia: x^{2} =7-3 x^{2}y.
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Răspuns :

x²+4x²=7
5x²=7
x²=7/5
x=+-√7/√5=+-√35/5

[tex] x^{2} +4 x^{2} =7 [/tex]
[tex]5 x^{2} =7[/tex][tex]
 x^{2} =7/5[/tex]