what is the value of n?

Answer:
n=3
Step-by-step explanation:
if we raise both sides to the power n we get
[tex]54x^{7}y^{3} = 3^{n}x^{2n}y^{n}*2x[/tex]
so as you see [tex]y^{3} =y^{n}[/tex] so n=3