(1 2/7у-1/2):3/4)=5 1/13

[latex](1\frac27y-\frac12):\frac34=5\frac1{13}\\(\frac97y-\frac12)\cdot\frac43=\frac{66}{13}\\(\frac97y-\frac12)\cdot\frac43\cdot\frac34=\frac{66}{13}\cdot\frac34\\(\frac97y-\frac12)=\frac{99}{26}\\\frac97y=\frac{99}{26}+\frac{13}{26}\\\frac97y=\frac{112}{26}=\frac{56}{13}\\y=\frac{56}{13}\cdot\frac79=\frac{392}{117}=3\frac{41}{117}[/latex]