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x supra x-3 = 10 supra 4. Valoarea lui x este...?

Răspuns :

X/x-3=10/4=>10x-30=4x=>10x-4x=30=>6x=30=>x=30:6=>x=5

x/x-3=10/4=>10x-30=4x=>10x-4x=30=>6x=30=>x=30:6=5