4 5/39 - (x + 1 7/26) = 2 13/13

45/39-(x+17/26)=213/13 45/(x+17/26)=39-16 45/(x+17/26)=23 x+17/26=45/23 x+17/26=2 x+17=26*2 x+17=52 x=52-17 x=35 ------- 45/39-(35+17/26)=213/13                        16=16