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daca 3x+4y supra 2x +y egal cu 7 supra 3

Răspuns :

(3x+4y)/(2x+y)=7/3

3×(3x+4y)=7×(2x+y)

9x+12y=14x+7y

12y-7y=14x-9x

5y=5x

y=x

x/y=1