Ahh, but it IS a trick question. Due to the nature of the way the symbols work, you only need to look at four possibilities to eliminate them all.
(3-3) = 0, you'll get nowhere with that.
(3/3) = 1, can't get very far with a 1 either.
(3x3) = 9, you used your multiply, you have one add to use and it's downhill from there.
(3+3) = 6, used your add already, 3 x 6 = 18, downhill from there.
You simply can't get a high enough number with any of them for the rest to work, you will always end up with a smaller number if you continue the problem.
But if you use x as a variable, this is possible:
(3 + 3)x3 - 3 / 3 = 29, where x = 5
6*5*3 = 90
90 - 3 = 87
87 / 3 = 29