1/3(8y-2)+1/9(12y+10)=
$$1/3(8y-2)+1/9(12y+10)\\\\ =\frac{(8y-2)}{3}+\frac{12y+10}{9}\\\\ =\frac{(8y-2)*3}{3*3}+\frac{12y+10}{9}$$
Can you take it from here?