Răspuns:
Explicație pas cu pas:
0,2(6) = (26 - 2)/90 = 24/90 = 8/30 = 4/15
40/100 = 4/10 = 2/5
2x/3 + 4/15 = 2x/5
2x/5 - 2x/3 = 4/15
x/5 - x/3 = 2/15
3x/15 - 5x/15 = 2/15
-2x/15 = 2/15
-2x = 2
x = 2 : (-2) = -1
