Question 430362
2/(x+1) - 4/(x-1) 
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[2(x-1)-4(x+1)]/[x^2-1]
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[2x-2-4x-4]/[x^2-1]
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[-2x-2]/[x^2-1]
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= [-2(x+1)]/[x^2-1]
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= [-2]/[x-1]
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Cheers,
Stan H.