(78 + 83 + 81 + x)/4 = x - 7 怎么解,(78 + 83 + 81 + x)/4 = x - 7
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![(78 + 83 + 81 + x)/4 = x - 7 怎么解,(78 + 83 + 81 + x)/4 = x - 7](/uploads/image/z/750657-57-7.jpg?t=%EF%BC%8878+%2B+83+%2B+81+%2B+x%EF%BC%89%2F4+%3D+x+-+7+%E6%80%8E%E4%B9%88%E8%A7%A3%2C%EF%BC%8878+%2B+83+%2B+81+%2B+x%EF%BC%89%2F4+%3D+x+-+7)
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(78 + 83 + 81 + x)/4 = x - 7 怎么解,(78 + 83 + 81 + x)/4 = x - 7
(78 + 83 + 81 + x)/4 = x - 7 怎么解,
(78 + 83 + 81 + x)/4 = x - 7
(78 + 83 + 81 + x)/4 = x - 7 怎么解,(78 + 83 + 81 + x)/4 = x - 7