(x-1)(x-2)-3x(x+3)+2[(x+2)(x+1)-3]
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(x-1)(x-2)-3x(x+3)+2[(x+2)(x+1)-3]
![(x-1)(x-2)-3x(x+3)+2[(x+2)(x+1)-3]](/uploads/image/z/6996485-29-5.jpg?t=%28x-1%29%28x-2%29-3x%28x%2B3%29%2B2%5B%28x%2B2%29%28x%2B1%29-3%5D)
(x-1)(x-2)-3x(x+3)+2[(x+2)(x+1)-3]
=(x²-3x+2)-(3x²+9x)+2[(x²+3x+2)-3]
=x²-3x+2-3x²-9x+2(x²+3x-1)
=x²-3x+2-3x²-9x+2x²+6x-2
=-6x
=(x²-3x+2)-(3x²+9x)+2[(x²+3x+2)-3]
=x²-3x+2-3x²-9x+2(x²+3x-1)
=x²-3x+2-3x²-9x+2x²+6x-2
=-6x
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