Divide both sides by 49/36 to get y by itself:
[tex]\frac{7}{12} \div \frac{49}{36} [/tex]
[tex]\frac{7}{12} \times \frac{36}{49} = \frac{254}{588}[/tex]
Simplify this fraction:
[tex] \frac{254}{588} \div \frac{2}{2} = \frac{127}{294}[/tex]
Now you have your answer:
[tex]y = \frac{127}{294}[/tex]