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OpenStudy (anonymous):
simplify the rational exprression. 27x-21/7-9x
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OpenStudy (anonymous):
start with \[\frac{3(9x-7)}{7-9x}\]
OpenStudy (anonymous):
and since \(\frac{9x-7}{7-9x}=-\frac{9x-7}{9x-7}=-1\) you are left with \(-3\)
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