(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

(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