Buna! Uite cum as rezolva eu problema:
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[tex]\frac{5x-2y}{x+y} =\frac{1}{3} ==>(5x-2y)*3= x+y\\15x-6y=x+y\\[/tex]
15x-x=y+6y
14x=7y | :7
2x=y ==> x/y=1/2
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SPER CA TE-AM AJUTAT!!