Răspunsuri

2014-03-10T14:42:29+02:00
6(2+x)=7(x-1)
12+6x=7x-7
12+7=7x-6x
19=x

Verificare
6(2+19)=7(19-1)
6*21=7*18
126=126
2014-03-10T14:56:50+02:00