Решите уравнения

а)[tex]2(x+4)-x(x-5)=7(x-8)[/tex]

б)[tex]6x^{2}+x^{2}-1=0[/tex]

 

Сократите дробь

[tex]\frac{2x^{2}+5x-7}{x^{2}-8x+7}[/tex]

 

Желательно в подробностях)

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