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algol13
3 years ago
9

Please help for 18 n 19

Mathematics
1 answer:
Hitman42 [59]3 years ago
7 0
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)}


\frac{2}{x}+ \frac{12}{x}=7 \\    \\  \frac{14}{x} =7 \\  \\ x= \frac{14}{7} \\  \\ x=2
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