Răspuns:
X = 1 / 19
Explicație pas cu pas:
X x ( 2 2 / 3 x 1 7 / 8 - 7 / 2 : 14 ) = 1 / 4
X x ( 8 / 3 x 15 / 8 - 7 / 2 : 14 ) = 1 / 4
X x ( 5 - 7 / 2 : 14 ) = 1 / 4
X x ( 5 - 7 / 2 x 1 / 14 ) = 1 / 4
X x ( 5 - 1 / 4 ) = 1 / 4
X x ( 20 / 4 - 1 / 4 ) = 1 / 4
X x 19 / 4 = 1 / 4
19 / 4x = 1 / 4
X = 1 / 19