exam Maths Puzzle Numerical Ability

19. x/6-2/9=-5/12
37. 4/5x-(x+3/2)=1/4(x-1/3)
39. 1/3x+5(1/9x-4)=8

please help me solve these problems i am having problems. thanks!!!

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exam Other Question

Write The percent as a fraction in simplest form.



4. 17%

Any help with this equation would be Greatly</b> appreciated.
Find the inverce of the function f(x)= 2/3x- 3/5.

I know the answer is f^-1 (x) =3/2x + 9/10.

It is really important to me to know how it is done. I need to know the solution. Thanks