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12分之5x减去3分之1等於負4分之1 方程兩邊同時乘上12得:12×(5/12)x-12×(1/3)=(-1/4)×12 5X-4=-3 方程兩邊同時加上4得:5X+4-4=-3+4 5X=1 方程兩邊同時除以5得:5X/5=1/5 X=0.2
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