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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x-(((7*18)/5)*x)-35 = 0
(-126/5)*x+3/x-35 = 0
3*x^-1-126/5*x^1-35*x^0 = 0
(3*x^0-126/5*x^2-35*x^1)/(x^1) = 0 // * x^2
x^1*(3*x^0-126/5*x^2-35*x^1) = 0
x^1
(-126/5)*x^2-35*x+3 = 0
(-126/5)*x^2-35*x+3 = 0
DELTA = (-35)^2-(3*4*(-126/5))
DELTA = 7637/5
DELTA > 0
x = ((7637/5)^(1/2)+35)/(2*(-126/5)) or x = (35-(7637/5)^(1/2))/(2*(-126/5))
x = -5/252*((7637/5)^(1/2)+35) or x = -5/252*(35-(7637/5)^(1/2))
x in { -5/252*((7637/5)^(1/2)+35), -5/252*(35-(7637/5)^(1/2))}
x in { -5/252*((7637/5)^(1/2)+35), -5/252*(35-(7637/5)^(1/2)) }
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