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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1-(3*x))^2 = 9*x^2-(7/x) // - 9*x^2-(7/x)
(1-(3*x))^2-(9*x^2)+7/x = 0
(1-3*x)^2-9*x^2+7/x = 0
(x*(1-3*x)^2)/x+(-9*x*x^2)/x+7/x = 0
x*(1-3*x)^2-9*x*x^2+7 = 0
x-6*x^2+7 = 0
x-6*x^2+7 = 0
x-6*x^2+7 = 0
DELTA = 1^2-(-6*4*7)
DELTA = 169
DELTA > 0
x = (169^(1/2)-1)/(-6*2) or x = (-169^(1/2)-1)/(-6*2)
x = -1 or x = 7/6
(x+1)*(x-7/6) = 0
((x+1)*(x-7/6))/x = 0
((x+1)*(x-7/6))/x = 0 // * x
(x+1)*(x-7/6) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-7/6 )
x-7/6 = 0 // + 7/6
x = 7/6
x in { -1, 7/6 }
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