Bonjour
(x-1)(x+3)-(x-1/2)(x+1)
X^2 + 3x -x -3 -(x^2 +x -1/2x -1/2)
X^2 + 2x -3 -x^2 -x +1/2x + 1/2
X + 1/2x -3 + 1/2
2/2x +1/2x -6/2 + 1/2
3/2x -5/2
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Bonjour
(x-1)(x+3)-(x-1/2)(x+1)
X^2 + 3x -x -3 -(x^2 +x -1/2x -1/2)
X^2 + 2x -3 -x^2 -x +1/2x + 1/2
X + 1/2x -3 + 1/2
2/2x +1/2x -6/2 + 1/2
3/2x -5/2