y.(11/12+3/4)=10/11
y.5/3=10/11
y=10/11:5/3
y=6/11
\(=>y=\dfrac{10}{11}:\left(\dfrac{11}{12}+\dfrac{3}{4}\right)=\dfrac{10}{11}:\left(\dfrac{11}{12}+\dfrac{9}{12}\right)=\dfrac{10}{11}:\dfrac{5}{3}=\dfrac{6}{11}\)
\(\text{=> }y.\left(\dfrac{11}{12}+\dfrac{3}{4}\right)=\dfrac{10}{11}=>y.\dfrac{5}{3}=\dfrac{10}{11}=>y=\dfrac{10}{11}:\dfrac{5}{3}=\dfrac{6}{11}\)