3/x-1+2x/x+1 solve the following equation
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(3/x-1) + 2x/x+1. = [3(x+1) + 2x(x-1) ] / (x+1)(x-1)
= [3x+3+2x^2-2x] / x^2 - 1
= [2x^2+x+3.] / [(x^2) - 1]
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