Math HELP please! I really need help!!

Consider r(x) = (2x-7) / (4x-6)
a)Find and simplify: r(r(x))
b) Find and simplify: r^-1(x)
c) Verify that r(r(x)) = r^-1(x)

Please help me. I am really stuck and I can't find help any other way. Please & Thank you! Please.

Consider r(x) = (2x-7) / (4x-6)

a)Find and simplify: r(r(x))
plug r(x) in for x:

= {2[(2x-7)/(4x-6)] -7} / {4[(2x-7)/(4x-6)] -6}

= multiply by (4x-6)/(4x-6)

=[ (4x-14)-7(4x-6)]/[(8x-28)-6(4x-6)]

= (-24x+28)/(-16x+8)

= -4(6x-7)/-4(4x-2)

= (6x-7)/(4x-2)

B) let x= (2y-7)/(4y-6)= (1/2)-4/( 4y -6). By long division

X-1/2= -4/(4y-6)

4y-6= -4/( x-1/2)= -8/( 2x-1)
4y = 6-8/(2x-1)= (12x-14)/(2x-1)

Y= 2(6x-7)/4(2x-1)

r^-1(x)= (6x-7)/(4x-2)

C)they are the same!

Hoping this helps!