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Mathematics 13 Online
OpenStudy (anonymous):

-21= -x ? Anyyyoneeee??? (:

OpenStudy (anonymous):

change the sign of both side to +

OpenStudy (saifoo.khan):

|dw:1346981743034:dw|

OpenStudy (saifoo.khan):

|dw:1346981759254:dw|

OpenStudy (anonymous):

like that

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