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c in (-oo:+oo)
c*((20*c^3-(15*c^2)+35*c)/5) = 0
c*((20*c^3-15*c^2+35*c)/5) = 0
(c*(20*c^3-15*c^2+35*c))/5 = 0
20*c^3-15*c^2+35*c = 0
5*c*(4*c^2-3*c+7) = 0
4*c^2-3*c+7 = 0
DELTA = (-3)^2-(4*4*7)
DELTA = -103
DELTA < 0
5*c = 0
(5*c*c)/5 = 0
( 5*c )
5*c = 0 // : 5
c = 0
( c )
c = 0
c in { 0, 0 }
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