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0.2x-0.7=0.3x-0.9 0.2x-0.7-0.3x+0.9=0 -0.1x+0.2=0 -0.1x=-0.2 x=2
0.7分之2x-1=0.3分之X-7分之1 20x/7-1=10x/3-1/7 60x-21=70x-3 60x-70x=-3+21 -10x=18 x=-1.8
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