simplify the degree of the following expression

Jobbrirj

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what is photosynthesis
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10x2-3xy+9y2-3x2-6xy-3y2
= 7x2+3xy+12y2
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10x2 - 3xy + 9y2 -(3x2 -6xy - 3y2 )

=10x2 - 3xy + 9y2 - 3x2 + 6xy + 3y2 
=10x2 - 3x2 - 3xy + 6xy + 9y2 + 3y2
=7x2 + 3xy + 12y2

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