Răspuns:
2/5(3+1/4 :x) = 4/3
2/5(3+1/4·1/x) = 4/3
2/5(3+1/4x) = 4/3
3+1/4x = 4/3 · 2/5
3+1/4x = 10/3
1/4x = 10/3 - 3
1/4x = (10-9)/3
1/4x = 1/3
4x = 3 ⇒ x = 3/4
