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Mathematics 7 Online
OpenStudy (quickstudent):

Is this correct? (5x^2 + 3x - 4) - (x^2 - 6x) 5x^2 + 3x - 4 - x^2 + 6x 5x^2 - x^2 + 3x + 6x - 4 4x^2 + 9x - 4

OpenStudy (perl):

Looks good :)

OpenStudy (quickstudent):

Thanks!

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