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Sorry guys, it was a typing mistake. The "30x" should have been 30x^3. I didn't even noticed that I typed it that way. If I actually used the 30x, I would have never have gotten the answer.
I used Mathematica.
krassi_holmz ... i want the way you get the answer please man
thanks everybody for helping as kempos said i dind't get that one
i don't get this step:
Here's my stab.
I think the best way of doing this would be to solve y³ + 3y + 30 = 0, then use that answer to solve y = x-1/x.
try to get X :