3. Simplify the following:
(1) (2x - 3y) (3x + y) + (x + 2y) (x - y)
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Answer:
(2x-3y)(3x+y)+(x+2y)(x-y)
=6x² -9xy+2xy-3y²+x²+2xy-xy-2y²
=6x²-7xy-3y²+x²+xy-2y²
=7x²-6xy-5y²
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