Răspuns :
a = suma initiala
a - a / 7 = a / 7 + 350
a - a/ 7 - a/7 = 350
7 a - 2 a = 7 x 350
5 a = 7 x 350
a = ( 7 x 350) : 5
a = 7 x 70
a = 490 lei → suma initiala
a - a / 7 = a / 7 + 350
a - a/ 7 - a/7 = 350
7 a - 2 a = 7 x 350
5 a = 7 x 350
a = ( 7 x 350) : 5
a = 7 x 70
a = 490 lei → suma initiala
x=suma initiala
x-7/x=7/x+350
x-7/x-7/x=350
7x-2x=350:7
x=(350:7):5
x=70*7
x=490=>suma initiala
x-7/x=7/x+350
x-7/x-7/x=350
7x-2x=350:7
x=(350:7):5
x=70*7
x=490=>suma initiala