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依題意,得x−x−13=7−x+35去分母得:15x-5(x-1)=105-3(x+3)去括號得:15x-5x+5=105-3x-9移項得:15x-5x+3x=105-9-5合併得:13x=91係數化為1得:x=7∴當x=7時,x−x−13的值與7−x+35的值相等.
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