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Mathematics 9 Online
OpenStudy (anonymous):

Solve 15 - x = 2.

OpenStudy (ivettef365):

15 - x = 2 -15 -15 ---------------- -x = -13 ---- --- -1 -1 then x = 13

OpenStudy (ivettef365):

To check substitute 13 for x you have 15 - (13) = 2 2 = 2 is correct

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