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c in (-oo:+oo)
(c/25)*c+(5*c)/15-2 = 0
1/25*c^2+1/3*c-2 = 0
DELTA = (1/3)^2-(-2*1/25*4)
DELTA = 97/225
DELTA > 0
c = ((97/225)^(1/2)-1/3)/(1/25*2) or c = (-(97/225)^(1/2)-1/3)/(1/25*2)
c = 25/2*((97/225)^(1/2)-1/3) or c = -25/2*((97/225)^(1/2)+1/3)
c in { -25/2*((97/225)^(1/2)+1/3), 25/2*((97/225)^(1/2)-1/3) }
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