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0.1*(x-3/7)=(3/5)totul la a doua 
     Ajutati-ma va rog!!


Răspuns :

0.1*(x-3/7)=(3/5)²
1/10*(x-3/7)=(9/25)
x-3/7=9/25:1/10
x-3/7=9/25*10/1
x-3/7=90/25

x=90/25+3/7

x=18/5+3/7
x=126/35+15/35
x=141/35