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D( w )
w^7 = 0
w^7 = 0
w^7 = 0
1*w^7 = 0 // : 1
w^7 = 0
w = 0
w in (-oo:0) U (0:+oo)
-4 = 3/(w^7) // - 3/(w^7)
-(3/(w^7))-4 = 0
-3*w^-7-4 = 0
-3*w^-7 = 4 // : -3
w^-7 = -4/3
-7 < 0
1/(w^7) = -4/3 // * w^7
1 = -4/3*w^7 // : -4/3
-3/4 = w^7
w^7 = -3/4 // ^ 1/7
w = -(3/4)^(1/7)
w = -(3/4)^(1/7)
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