20. From the sum of 2x² + 3xy - 5 and 7 + 2xy – x? subtract 3xy + x2 - 2.
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Step-by-step explanation:
2x² + 3xy - 5 + 7 + 2xy – x -(3xy + x² -2)
= 2x² +5xy +2-x-3xy-x²+2
= x²+2xy -x+4
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