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Mathematics 12 Online
OpenStudy (anonymous):

3X-7Y=3X+(-7Y)

OpenStudy (texaschic101):

3X - 7Y = 3X +(-7Y) 3X - 7Y = 3X - 7Y 3X - 3X = 7Y - 7Y 0 = 0 This equation had infinite solutions :)

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