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3x-7=0 x=7/3 將x=7/3代入2x+3y-1=0 得14/3+3y-1=0 3y+11/3=0 y=-11/9 將x=7/3 y=-11/9代入2x+y-m=0 得14/3-11/9+m=0 m=-31/9
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