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OpenStudy (anonymous):
Subtract 3-x/x-7 - 4x-9/7-x 3-x over x-7 minus 4x-9 over 7-x
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OpenStudy (gw2011):
Find a common denominator which is (x-7)(7-x) [(3-x)(7-x)-(4x-9)(x-7)]/(x-7)(7-x) [21-10x+x^2-(4x^2-37x+63)]/(x-7)(7-x) (21-10x+x^2-4x^2+37x-63)/(x-7)(7-x) (-3x^2+27x-42)/(x-7)(7-x) [-3(x^2-9x+14)]/(x-7)(7-x) [-3(x-7)(x-2)]/(x-7)(7-x) = (-3)(x-2)/7-x
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