3x^2-[5x-(2/1x-3)+2x^2]=

3x²-[5x-(1/2x-3)+2x²]
=3x²-[5x-1/2 x+3+2x²]
=3x²-（2x²+9/2 x+3）
=3x²-2x²-9/2 x-3
=x²-9/2x-3

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