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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-(4/x)-3 = -7 // + 7
3*x-(4/x)-3+7 = 0
3*x-4*x^-1-3+7 = 0
3*x^1-4*x^-1+4*x^0 = 0
(3*x^2+4*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(3*x^2+4*x^1-4*x^0) = 0
x^1
3*x^2+4*x-4 = 0
3*x^2+4*x-4 = 0
DELTA = 4^2-(-4*3*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)-4)/(2*3) or x = (-64^(1/2)-4)/(2*3)
x = 2/3 or x = -2
x in { -2, 2/3}
x in { -2, 2/3 }
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