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d in (-oo:+oo)
(1/3)*d^6+(1/5)*d^4 = 0
1/3*d^6+1/5*d^4 = 0
d^4*(1/3*d^2+1/5) = 0
1/3*d^2 = -1/5 // : 1/3
d^2 = -3/5
d^4 = 0
1*d^4 = 0 // : 1
d^4 = 0
d = 0
d = 0
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