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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/3+2/x = 31/15 // - 31/15
x/3+2/x-(31/15) = 0
x/3+2/x-31/15 = 0
1/3*x^1+2*x^-1-31/15*x^0 = 0
(1/3*x^2-31/15*x^1+2*x^0)/(x^1) = 0 // * x^2
x^1*(1/3*x^2-31/15*x^1+2*x^0) = 0
x^1
(1/3)*x^2+(-31/15)*x+2 = 0
(1/3)*x^2+(-31/15)*x+2 = 0
DELTA = (-31/15)^2-(2*4*(1/3))
DELTA = 361/225
DELTA > 0
x = ((361/225)^(1/2)-(-31/15))/(2*(1/3)) or x = (-(-31/15)-(361/225)^(1/2))/(2*(1/3))
x = 5 or x = 6/5
x in { 6/5, 5}
x in { 6/5, 5 }
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