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stiind ca 7x+2y/3x+5y=2/3, aflati x/y+x​

Răspuns :

[tex] \frac{7x + 2y}{3x + 5y} = \frac{2}{3} [/tex]

facem produsul mezilor cu cel al extremilor

așadar, =>

3(7x+2y)=2(3x+5y)

21x+6y=6x+10y

21x-6x=10y-6y

15x=4y

=>

15x-4y=0