Add x² +xy+² to sum of x² - 3y² and 2x² - y² +9
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(x² - 3y² +2x² - y² +9)+x² +xy²
(x²+2x²-3y²-y²+9)+x² +xy²
= 3x²-4y²+9+x² +xy²
=3x²+x²-4y²+ xy²+9
=4x² -4y²+ xy²+9
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