I assume that's an "x" in the denominator.
1) Try u^2 = 5x+3. This will get you a rational exp. in u, but the deg(num) > deg(dem)
2) Do a long division and you will a remainder of 18/(u^2-3)
3) Partial fractions on the remainder
I should have mentioned why I picked that particular sub. If the bracket was just cubed and not to the 3/2, then you could easily multiply it out, divide all the terms by x and integrate term by term. So the u^2 sub gets rid of the fractional exponents and makes life a lot easier.
Kindly see the solution