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(a-x)/((1/2)*(a^2-x^2))
x*y-(6*x)-(9*z);y*z-(8*x);9*z-(8*x)+12
14;4
(1/2)*((a-x)/(a^2-x^2))
2*x^3-(10*x^2)-(32*x)+0 = 0
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