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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((7*x)/3)*x-((2*x)/x)-2+1 = 0
((7*x)/3)*x-2-2+1 = 0
7/3*x^2 = 3 // : 7/3
x^2 = 9/7
x^2 = 9/7 // ^ 1/2
abs(x) = (9/7)^(1/2)
x = (9/7)^(1/2) or x = -(9/7)^(1/2)
x in { (9/7)^(1/2), -(9/7)^(1/2) }
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