From the sum of 2x2y2-3xy+4 and 5+7xy -3x2y2, subtract (5x2y2-4y2+6xy-3)
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Sum = 2x2y2-3xy+4 + 5+7xy-3x2y2
= 8xy - 3xy + 4 + 5 + 7xy - 12xy
= 5xy +9 - 5xy
= 9
Difference=( 5x2y2-4y2+6xy -3 ) - 9
= 20xy - 8y + 6xy -12
= 26xy - 8y -12
= 8xy - 3xy + 4 + 5 + 7xy - 12xy
= 5xy +9 - 5xy
= 9
Difference=( 5x2y2-4y2+6xy -3 ) - 9
= 20xy - 8y + 6xy -12
= 26xy - 8y -12
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