-(x²y+3xy-4)+3(x²y-xy+2)

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-(x²y+3xy-4)+3(x²y-xy+2)-(x²y+3xy-4)+3(x²y-xy+2) -(x²y+3xy-4)+3(x²

-(x²y+3xy-4)+3(x²y-xy+2)
-(x²y+3xy-4)+3(x²y-xy+2)
 

-(x²y+3xy-4)+3(x²y-xy+2)