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docaophuoc2002
2 năm trước
X+12=-45 X-18=-32 X-(-17)=-43 X+(-35)=-55 13-x=19 17-x=-45 -32-x=45 -19-(-x) =12 X-34-x=45 X+23=(-7).(-3) 2x-12=-24 3x+9=-27 5x+15=45 7x-14=-49
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