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x² + 2x - 3 = 0
x + 3
x - 1
(x + 3)(x - 1) = 0
x +3
x -1
3x - x = 2x
(x+3)(x-1) = 0
x +3 = 0 x - 1 = 0
x = -3 x = 1
CS = (-3; 1)