2,5 = 25 /10 = 5 /2
0,4 =4 /10 = 2 /5
1,4 = 14 /10 = 7 / 5
5 /2 · ( x + 2 /5) = 7x / 5 + 3 numitor 10
5 · 5 · ( x + 2 /5) = 2· 7x + 3· 10
25 · ( x + 2 /5) = 14x + 30
25x + 25 · 2 /5 = 14x + 30
25x + 10 =14x + 30
25x - 14x = 30 - 10 ; 11x = 20 ; x = 20 /11