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phamkhanhlinh21122005
2 năm trước
a) x-2/7 - 3-x/5 = 2+3x/10 b) 2x-1/4 + x-2/8 -x = 3x-1/3 - 7x+2/9 c) x+1/31 + x-3/33 = x-1/32 + x-5/34 d) x+1/35 + x+6/15 = x+5/31 + x-2/19
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