Ответы и объяснения

2014-01-17T23:04:29+04:00
X+5/14= 5/6
х = 5/6 - 5/14
x = (7/7)*(5/6) - (3/3)*(5/14)
x = 35/42 - 15/42
x = (35-15)/42
x = 20/42
x = 10/21