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Mathematics 18 Online
OpenStudy (anonymous):

medal and fan awarded which factor can you cancel from the numerator and denominator to simplify 7x - 21 over 17 - 6x [hint: (a - x) = -(x - a)]

OpenStudy (nurali):

Also, plugging in x=3 to the numerator gives 7*3 - 21 = 0, and to the denominator gives 18-6*3 = 0. In both cases, then, (x-3) is a factor.

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