Try another version of this question Subtract and simplify. `7/( x-9)-12/( x+9)` `171/(x^2-81)` `(-5 x+171)/(x^2-81)` `(-5 x-171)/(x^2-81)` `(171 x-5)/(x^2-81)` `171/( x-9)` Box 1: Select the best answer `(-5 x+171)/(x^2-81)`
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Box 1: Select the best answer