(5x-y)-(5x+y)=5x-y-5x-y=-2y
(4-x+3x²)-(2x²-x+4)=4-x+3x²-2x²+x-4=x²
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(5x-y)-(5x+y)=5x-y-5x-y=-2y
(4-x+3x²)-(2x²-x+4)=4-x+3x²-2x²+x-4=x²