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2分之x+3=5分之x-1-1 兩邊乘以10得 5(x+3)=2(x-1)-10 5x+15=2x-2-10 3x=-27 x=-9 3分之x-2=2分之x-3 兩邊乘以6得 2x-4=3x-9 -x=-5 x=5
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