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3x²y-[2xy²-2(xy-(3/2)x²y)+xy]+3xy³
=3x²y-2xy²+2(xy-(3/2)x²y)-xy+3xy³
=3x²y-2xy²+2xy-3x²y-xy+3xy³
=xy-2xy²+3xy³
=3x²y-2xy²+2(xy-(3/2)x²y)-xy+3xy³
=3x²y-2xy²+2xy-3x²y-xy+3xy³
=xy-2xy²+3xy³
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