[tex] \left \{ {{8x-y=5} \atop {-9x+2y=4}} \right. [/tex]
Помогите решить алгебраическим методом,вот подстановкой умею,а этим методом нет(
еще пож:[tex] \frac{2x-7}{3}= \frac{5x+4}{5} [/tex]
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