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Show that if f: R-{7/5}->R-{3/5} is ...

Show that if `f: R-{7/5}->R-{3/5}` is defined by `f(x)=(3x+4)/(5x-7)` and `g: R-{3/5}->R-{7/5}` is define by `g(x)=(7x+4)/(5x-3)` , then `fog=I_A` and `gof=I_B` , where `A=R-{3/5}, B=R-{7/5}; I_A(x)=x ,AAx in A , I_B(x)=x ,AAx in B` are called ideal

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