book Maths Puzzle Numerical Ability

Solve for x: 7x/x-2 + 2x/x+2 =9 I thought you would use (x-2)(X+2) as your LCD, But I can't seem to come up with an answer after I do that. I keep coming up with 7x+2x=9(x-2)(X+

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is this correct?

f(x+1) for sqrt x^2+x

=sqrt (x+1)^2+X+1
=sqrt x^2+2x+1+x+1
=sqrt x^2+3x+2
=2sqrt3x+1

thanks!!
A=3; B=13
G-A=3
F+G=D
C+D+E=B
C-D=G
B+E=C+D Please solve this for me!