8(x : 1_7/9 - 1_ 3/4) = 13 x : 1_ 7/9 - 1_3/4 = 13 /8 x : 1_ 7/9 = 1_5/8+1_3/4 х: 1_7/9 = 1_5/8 + 1_6/8 х : 1_7/9 = 2_11/8 х= 27/8 * 16/9 х=3 / 2 х=1_1/2