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Resolve `(1)/(x^(2)-7x-18)` into partical fractions.

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Resolve `(1)/(x^(2)-7x-18)` into partical fractions.
A. `(1)/(11)((1)/(x-9)-(1)/(x+2))`
B. `(1)/(11)((1)/(x-9)+(1)/(x+2))`
C. `(1)/(11)((1)/(x+9)-(1)/(x-2))`
D. `(1)/(11)((1)/(x+9)+(1)/(x+2))`
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`(1)/(x^(2)-7x-18)=(A)/(x-9)+(B)/(x+2)`.
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