Решите любым из 4 способов!!!(алгебраического сложения,почленного деления,группировки,введения новой переменной)
[tex] \left \{ {{2 x^{2} +2y^{2}+x-y-4=0 } \atop {3 x^{2}+3 y^{2}+2x-y-7=0 }} \right. [/tex]
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