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2.
2a+b
3.
-y^3+7y^3-2y+y= 6y^3 - y
4.
3a*2ab^2= 6a^2b^2
5.
4x(x+y)
6.
2x^2+4+x^2-5= 3x^2-1
3x^2-2x-4x-5= 3x^2-6x-5