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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x+1/x-1 = 20*x-((3/5)*x)-7 // - 20*x-((3/5)*x)-7
4*x-(20*x)+(3/5)*x+1/x-1+7 = 0
4*x-20*x+(3/5)*x+1/x-1+7 = 0
1*x^-1-77/5*x^1+6*x^0 = 0
(6*x^1-77/5*x^2+1*x^0)/(x^1) = 0 // * x^2
x^1*(6*x^1-77/5*x^2+1*x^0) = 0
x^1
(-77/5)*x^2+6*x+1 = 0
(-77/5)*x^2+6*x+1 = 0
DELTA = 6^2-(1*4*(-77/5))
DELTA = 488/5
DELTA > 0
x = ((488/5)^(1/2)-6)/(2*(-77/5)) or x = (-(488/5)^(1/2)-6)/(2*(-77/5))
x = -5/154*((488/5)^(1/2)-6) or x = 5/154*((488/5)^(1/2)+6)
x in { -5/154*((488/5)^(1/2)-6), 5/154*((488/5)^(1/2)+6)}
x in { -5/154*((488/5)^(1/2)-6), 5/154*((488/5)^(1/2)+6) }
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