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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-x-((7/2)*x)-(4/x)-10-5 = 0
3*x-x+(-7/2)*x-4*x^-1-10-5 = 0
-3/2*x^1-4*x^-1-15*x^0 = 0
(-3/2*x^2-15*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(-3/2*x^2-15*x^1-4*x^0) = 0
x^1
(-3/2)*x^2-15*x-4 = 0
(-3/2)*x^2-15*x-4 = 0
DELTA = (-15)^2-(-4*4*(-3/2))
DELTA = 201
DELTA > 0
x = (201^(1/2)+15)/(2*(-3/2)) or x = (15-201^(1/2))/(2*(-3/2))
x = (201^(1/2)+15)/(-3) or x = (15-201^(1/2))/(-3)
x in { (201^(1/2)+15)/(-3), (15-201^(1/2))/(-3)}
x in { (201^(1/2)+15)/(-3), (15-201^(1/2))/(-3) }
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