Question 695865
f(x)=2x-3
f(x)=0 
2x-3=0
2x=3
x=3/2
f(f(x))=0
f(2x-3)=2(2x-3)-3
       =4x-6-3
       =4x-9
f(f(x))=0
4x-9=0
4x=9
x=9/4