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詳解 (共 1 筆)

詳解提供者：piano_chien

x = 3y + 3 --> x -3y = 3 ----(1)

2y = x -5 --> x -2y = 5 ----(2)

(2) - (1) --> y = 2

代入(2) --> x = 9

x + y = 11