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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/2)*x-(7/x) = -3 // + 3
(3/2)*x-(7/x)+3 = 0
(3/2)*x-7*x^-1+3 = 0
3/2*x^1-7*x^-1+3*x^0 = 0
(3/2*x^2+3*x^1-7*x^0)/(x^1) = 0 // * x^2
x^1*(3/2*x^2+3*x^1-7*x^0) = 0
x^1
(3/2)*x^2+3*x-7 = 0
(3/2)*x^2+3*x-7 = 0
DELTA = 3^2-(-7*4*(3/2))
DELTA = 51
DELTA > 0
x = (51^(1/2)-3)/(2*(3/2)) or x = (-51^(1/2)-3)/(2*(3/2))
x = (51^(1/2)-3)/3 or x = (-(51^(1/2)+3))/3
x in { (-(51^(1/2)+3))/3, (51^(1/2)-3)/3}
x in { (-(51^(1/2)+3))/3, (51^(1/2)-3)/3 }
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