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方法一: 2(2x-1)-4(x+1)=3(x+1)-5(2x-1) 7(2x-1)=7(x+1) 2x-1=x+1 x=2 方法二: 2(2x-1)-4(x+1)=3(x+1)-5(2x-1) 4x-2-4x-4=3x+3-10x+5 -6=-7x+8 7x=14x=2
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