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D( w )
w^2 = 0
w = 0
w^2 = 0
w^2 = 0
1*w^2 = 0 // : 1
w^2 = 0
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w/(w^2)-(3*w)-(7/w)-40+5 = 0
w/(w^2)-3*w-7*w^-1-40+5 = 0
-3*w^1-6*w^-1-35*w^0 = 0
(-3*w^2-35*w^1-6*w^0)/(w^1) = 0 // * w^2
w^1*(-3*w^2-35*w^1-6*w^0) = 0
w^1
-3*w^2-35*w-6 = 0
-3*w^2-35*w-6 = 0
DELTA = (-35)^2-(-6*(-3)*4)
DELTA = 1153
DELTA > 0
w = (1153^(1/2)+35)/(-3*2) or w = (35-1153^(1/2))/(-3*2)
w = (1153^(1/2)+35)/(-6) or w = (35-1153^(1/2))/(-6)
w in { (1153^(1/2)+35)/(-6), (35-1153^(1/2))/(-6)}
w in { (1153^(1/2)+35)/(-6), (35-1153^(1/2))/(-6) }
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