Răspuns:
2/3=2,3
2,3-1,5=0,8(x)
2/3+0,8=1,5
2/3+ x= 1,5
x=(15/10)⁽⁵-2/3
x=³⁾3/2-²⁾2/3
x=9/6-4/6
x=5/6=0,8(3)