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D( h )
3*(h+4) = 0
h+5 = 0
3*(h+4) = 0
3*(h+4) = 0
h+4 = 0 // - 4
h = -4
h+5 = 0
h+5 = 0
h+5 = 0 // - 5
h = -5
h in (-oo:-5) U (-5:-4) U (-4:+oo)
1/(h+5) = 1/(3*(h+4)) // - 1/(3*(h+4))
1/(h+5)-(1/(3*(h+4))) = 0
1/(h+5)+(-1/3)*(h+4)^-1 = 0
1/(h+5)-1/3/(h+4) = 0
(1*(h+4))/((h+5)*(h+4))+(-1/3*(h+5))/((h+5)*(h+4)) = 0
1*(h+4)-1/3*(h+5) = 0
2/3*h+7/3 = 0
(2/3*h+7/3)/((h+5)*(h+4)) = 0
(2/3*h+7/3)/((h+5)*(h+4)) = 0 // * (h+5)*(h+4)
2/3*h+7/3 = 0
2/3*h+7/3 = 0 // - 7/3
2/3*h = -7/3 // : 2/3
h = -7/3/2/3
h = -7/2
h = -7/2
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