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x=6*5+90*5 X=30+450 X=480
10*5分之2-(5分之20)x=5分之2 4-(5分之20)x=5分之2 (5分之20)x=4-5分之2 (5分之20)x=5分之(20-2)=5分之18 20x=18 10x=9 x=10分之9
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