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X-X/2=15 方程兩邊同乘以2得: 2X-X=30 X=30 如果原題X-2是整體做為分母的話: X/(X-2)=15 方程兩邊同乘以X-2得: X=15(X-2) X=15X-30 30=15X-X 14X=30 X=15/7
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