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Tìm x, biết : a, | x + 1 | + | 2x - 3 | = | 3x - 2 | b, | x - 3 | + | 5 - x | + 2|x - 4| =2 c, | 5x + 1 | + | 3 - 2x | = | 4 + 3x |
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