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Rational Expressionshard
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Given Ax−1+Bx+2=5x+1x2+x−2\frac{A}{x-1} + \frac{B}{x+2} = \frac{5x+1}{x^2+x-2}x−1A​+x+2B​=x2+x−25x+1​, find A−BA - BA−B.