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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(7/5)*x+(3/5)*x = 2/x // - 2/x
(7/5)*x+(3/5)*x-(2/x) = 0
(7/5)*x+(3/5)*x-2*x^-1 = 0
2*x^1-2*x^-1 = 0
(2*x^2-2*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-2*x^0) = 0
x^1
2*x^2-2 = 0
2*x^2-2 = 0
DELTA = 0^2-(-2*2*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+0)/(2*2) or x = (0-16^(1/2))/(2*2)
x = 1 or x = -1
x in { -1, 1}
x in { -1, 1 }
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