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OpenStudy (anonymous):
What is the sum of 7/x-1+9/x-8 ?
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OpenStudy (unklerhaukus):
\[\frac7{x-1}+\frac9{x-8}\\=\frac7{x-1}\times\frac{x-8}{x-8}+\frac9{x-8}\times\frac{x-1}{x-1}\\=\frac{7(x-8)+9(x-1)}{(x-1)(x-8)}\\=\\=\]
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