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Cho đường thẳng d có phương trình: mx + (m + 2)y - 1 = 0. Đường thẳng d luôn đi qua một điểm cố định tại tọa độ? A. (-1; -1/2) B. (-1; 1/2) C. (-1/2 ; -1) D. (1/2; 1)
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