3xsq minus xsq minus 3x +1
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- 3x^2 - x^2 - 3x + 1
- 2x^2 - 3x + 1
- 2x^2 - 2x - x + 1
- 2x(x-1) - 1(x+1)
- (2x-1) - (x-1)
2x-1=0 x-1=0
x=1/2 x=1
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