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Mathematics 12 Online
OpenStudy (anonymous):

Find all digits x and y such that 6xx (bar on top) -1y8 (bar on top) = 47y (bar on top). As usual, 6xx (bar on top) is the 3 digit number with 6 in the hundreds place, x in the tens place, and x in the ones place, etc.

OpenStudy (anonymous):

|dw:1424416533596:dw|

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