Răspunsuri

2014-03-14T21:46:29+02:00
2014-03-14T21:53:31+02:00
DVA:x apartine multimii numerelor reale R inafara de {1/2}
7/2x-1=21/15
7*15=21*(2x-1)
42x-21=105
42x=126
x=3