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2) (4x-1) - (2x-10) = 2x+9
3) (a+b+c) - (a-b+c) = 2b
4) (4x^2-4x+8) - (6x^2+4x-8)
= -2x^2-8x+16
= 2x^2+8x-16
= x^2+4x-8