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=-2x+4y+4
2. 2a^2b+6a^2+2ab^2 - a^2b+ab^2- b^2
a^2b+3ab^2+6a^2-b^2
3. 6p+2pq-a^2q+abq-bq
4. (3x-5)(x-2)
=3x^2-6x-5x+10
=3x^2-11x+10
5. (5x-y)^2
= 25x^2-10xy+y^2
6. (x+1)^2 / 4x^2