heyitsjassie
heyitsjassie
10-06-2017
Mathematics
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Please help for 18 n 19
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Banabanana
Banabanana
10-06-2017
[tex]18. \ \ \frac{-1}{x-9}- \frac{-2}{x+7}= \frac{-1(x+7)+2(x-9)}{(x-9)(x+7)}= \frac{-x-7+2x-18}{(x-9)(x+7)}= \frac{x-25}{(x-9)(x+7)}[/tex]
[tex] \frac{2}{x}+ \frac{12}{x}=7 \\ \\ \frac{14}{x} =7 \\ \\ x= \frac{14}{7} \\ \\ x=2 [/tex]
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