how do I  simplify 9x+2/3x^2-2x-8+7/3x^2+x-4

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First, gather the like terms.9x + 2/3x^2 - 2x - 8 + 7/3x^2 + x - 42/3x^2 + 7/3x^2 + 9x - 2x + x - 8 + 49/3x^2 + 8x - 4Simplify3x^2 + 8x - 4At this point, you could complete the square on this quadratic...but that's another lesson.The point is, there are LOTS of equivalent expressions. You need to be comfortable moving from one equivalent form to another.