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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w/w-(((5*w)/5)*w)-2-1 = w-((2/5)*w)-(7*w)+2 // - w-((2/5)*w)-(7*w)+2
(2/5)*w-(((5*w)/5)*w)-w+7*w+w/w-2-2-1 = 0
(2/5)*w-w^2-w+7*w+w/w-2-2-1 = 0
32/5*w-w^2-4 = 0
DELTA = (32/5)^2-(-4*(-1)*4)
DELTA = 624/25
DELTA > 0
w = ((624/25)^(1/2)-32/5)/(-1*2) or w = (-(624/25)^(1/2)-32/5)/(-1*2)
w = ((624/25)^(1/2)-32/5)/(-2) or w = ((624/25)^(1/2)+32/5)/2
w in { ((624/25)^(1/2)-32/5)/(-2), ((624/25)^(1/2)+32/5)/2 }
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