How to Find the Inverse of a Function

Q. FIND THE ROOTS OF THE FOLLOWING EQUATION: 1/X+4-1/X-7=11/30.X IS NOT EQUAL TO-4,

Q. 23. Solve for }x and }y where }x, y≠0 4x+6y=3xy 8x+9y=5xy

Q. Let $f:R\to R$ be defined as f(x) = 10x + 7. The function $g:R\to R$ such that gof = fog =$I_R$. Then g(2017) =

Q. Detailed explanation of multiplicative inverse.

Q. Solve the following inequality:
$\sqrt{x+2}>x.$