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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-(3/x) = 5/7 // - 5/7
2*x-(3/x)-(5/7) = 0
2*x-3*x^-1-5/7 = 0
2*x^1-3*x^-1-5/7*x^0 = 0
(2*x^2-5/7*x^1-3*x^0)/(x^1) = 0 // * x^2
x^1*(2*x^2-5/7*x^1-3*x^0) = 0
x^1
2*x^2+(-5/7)*x-3 = 0
2*x^2+(-5/7)*x-3 = 0
DELTA = (-5/7)^2-(-3*2*4)
DELTA = 1201/49
DELTA > 0
x = ((1201/49)^(1/2)-(-5/7))/(2*2) or x = (-(-5/7)-(1201/49)^(1/2))/(2*2)
x = ((1201/49)^(1/2)+5/7)/4 or x = (5/7-(1201/49)^(1/2))/4
x in { (5/7-(1201/49)^(1/2))/4, ((1201/49)^(1/2)+5/7)/4}
x in { (5/7-(1201/49)^(1/2))/4, ((1201/49)^(1/2)+5/7)/4 }
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