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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X*((2*X+4)/5)-(1/x) = 7/20 // - 7/20
X*((2*X+4)/5)-(1/x)-(7/20) = 0
X*((2*X+4)/5)-x^-1-7/20 = 0
(X*(2*X+4))/5-1/x-7/20 = 0
(20*X*x*(2*X+4))/(5*20*x)+(-1*5*20)/(5*20*x)+(-7*5*x)/(5*20*x) = 0
20*X*x*(2*X+4)-7*5*x-1*5*20 = 0
40*X^2*x+80*X*x-35*x-100 = 0
40*X^2*x+80*X*x-35*x-100 = 0
5*(8*X^2*x+16*X*x-7*x-20) = 0
-7*x-20 = 0 // + 20
-7*x = 20 // : -7
x = 20/(-7)
x = -20/7
5*(x+20/7) = 0
(5*(x+20/7))/(5*20*x) = 0
(5*(x+20/7))/(5*20*x) = 0 // * 5*20*x
5*(x+20/7) = 0
x+20/7 = 0 // - 20/7
x = -20/7
x = -20/7
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