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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/x-7 = x+10/x-5 // - x+10/x-5
(5*x)/x-x-(10/x)-7+5 = 0
(5*x)/x-x-10*x^-1-7+5 = 0
3*x^0-1*x^1-10*x^-1 = 0
(3*x^1-1*x^2-10*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^1-1*x^2-10*x^0) = 0
x^1
3*x-x^2-10 = 0
3*x-x^2-10 = 0
DELTA = 3^2-(-10*(-1)*4)
DELTA = -31
DELTA < 0
x in { }
x belongs to the empty set
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