p(x)=3-2x

g(x) = 3(x^2)-7
q(x)=(2-x)/(2x+3)

p q g(x) = ?

replace x by g(x) in q(x), then

q g(x)=(9-3x^2)/(6x^2-11)
hence p q g(x)=(24x^2-51)/(6x^2-11)