a) (4a-6b)*(2b-3a)
b) (2x-3y)*(x+2y)
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1. 8ab-12a²-12b²-18ab
=> -10ab-12a²-12b²
2. 2x²+4xy-3xy-6y²
=> 2x²-6y²+xy
=> -10ab-12a²-12b²
2. 2x²+4xy-3xy-6y²
=> 2x²-6y²+xy
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