Toán Lớp 7: a) x-1/7+x-1/9+x-1/11+x-1/13=0
b) 315+(125-x) : 5=435
c) 315+(125-x)=435
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Toán Lớp 7: a) x-1/7+x-1/9+x-1/11+x-1/13=0
b) 315+(125-x) : 5=435
c) 315+(125-x)=435
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