1)5/12+7/18=5/6 2) 3x/(x+1)-1/(x)=______/x^2-1x
= (3x^2-x-1)/(x(x+1)) = (3x^2-x-1)(x-1) / (x(x+1)(x-1)) = (3x^3 - 4x^2 - 1) / ((x^2-1)x)
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