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Dau Coroana
x-2,5 supra 3,5 =x supra 4


Răspuns :

x-2.5/3.5=x/4
x-25/10:35/10=x/4
x-25/10*10/35=x/4
x-5/7=x/4
2x-20=7x
2x-7x=20
5x=-20
x=-4