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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/1+1/x = 61/30 // - 61/30
x/1+1/x-(61/30) = 0
x+1/x-61/30 = 0
1*x^1+1*x^-1-61/30*x^0 = 0
(1*x^2-61/30*x^1+1*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-61/30*x^1+1*x^0) = 0
x^1
x^2+(-61/30)*x+1 = 0
x^2+(-61/30)*x+1 = 0
DELTA = (-61/30)^2-(1*1*4)
DELTA = 121/900
DELTA > 0
x = ((121/900)^(1/2)-(-61/30))/(1*2) or x = (-(-61/30)-(121/900)^(1/2))/(1*2)
x = 6/5 or x = 5/6
x in { 5/6, 6/5}
x in { 5/6, 6/5 }
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