已知斜率为3的直线过点(1,1)和(x,-2),求实数x的值
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![已知斜率为3的直线过点(1,1)和(x,-2),求实数x的值](/uploads/image/z/7212487-31-7.jpg?t=%E5%B7%B2%E7%9F%A5%E6%96%9C%E7%8E%87%E4%B8%BA3%E7%9A%84%E7%9B%B4%E7%BA%BF%E8%BF%87%E7%82%B9%281%2C1%29%E5%92%8C%28x%2C-2%29%2C%E6%B1%82%E5%AE%9E%E6%95%B0x%E7%9A%84%E5%80%BC)
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