Răspuns :
Notam fractia cu x.
(x*2+27/5):7/15 = 15
x*2 + 27/5 = 15 * 7/15 = 7
x*2 = 7-27/5 = 35/5 - 27/5 = 8/5
x = 8/5:2 = 8/5 * 1/2 = 4/5
x = 4/5
(x*2+27/5):7/15 = 15
x*2 + 27/5 = 15 * 7/15 = 7
x*2 = 7-27/5 = 35/5 - 27/5 = 8/5
x = 8/5:2 = 8/5 * 1/2 = 4/5
x = 4/5