x分之3000-(x+20)分之3000

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x分之3000-(x+20)分之3000x分之3000-(x+20)分之3000x分之3000-(x+20)分之300020-X分之X

x分之3000-(x+20)分之3000
x分之3000-(x+20)分之3000

x分之3000-(x+20)分之3000
20-X分之X