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x^2 - 2x + 3x - 6
= x^2 + x - 6
B. ( 2x - 1 ) ( x + 2y - 3 )
2x^2 + 4xy - 6x - x - 2y + 3
= 2x^2 + 4xy - 7x - 2y + 3
b. 2x"+4xy-6x-x-2y+3=2x"+4xy-7x-2y+3
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