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四分之x-3减八分之1+3x=1 去分母,兩邊同時乘以8得 2(x-3)-(1+3x)=8 去括弧得 2x-6-1-3x=8 合併同類項得 -x-7=8 移項得 -x=8+7 -x=15 係數化為1,兩邊同時除以-1得 x=-15 不懂得歡迎追問.
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