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c in (-oo:+oo)
(2/3)*c = c*((c+5)/4)-(5/12) // - c*((c+5)/4)-(5/12)
(2/3)*c-(c*((c+5)/4))+5/12 = 0
(-1*c*(c+5))/4+(2*c)/3+5/12 = 0
(-1*3*12*c*(c+5))/(3*4*12)+(2*4*12*c)/(3*4*12)+(3*4*5)/(3*4*12) = 0
2*4*12*c-1*3*12*c*(c+5)+3*4*5 = 0
60-36*c^2-84*c = 0
60-36*c^2-84*c = 0
12*(5-3*c^2-7*c) = 0
5-3*c^2-7*c = 0
DELTA = (-7)^2-(-3*4*5)
DELTA = 109
DELTA > 0
c = (109^(1/2)+7)/(-3*2) or c = (7-109^(1/2))/(-3*2)
c = (109^(1/2)+7)/(-6) or c = (7-109^(1/2))/(-6)
12*(c-((109^(1/2)+7)/(-6)))*(c-((7-109^(1/2))/(-6))) = 0
(12*(c-((109^(1/2)+7)/(-6)))*(c-((7-109^(1/2))/(-6))))/(3*4*12) = 0
(12*(c-((109^(1/2)+7)/(-6)))*(c-((7-109^(1/2))/(-6))))/(3*4*12) = 0 // * 3*4*12
12*(c-((109^(1/2)+7)/(-6)))*(c-((7-109^(1/2))/(-6))) = 0
( c-((109^(1/2)+7)/(-6)) )
c-((109^(1/2)+7)/(-6)) = 0 // + (109^(1/2)+7)/(-6)
c = (109^(1/2)+7)/(-6)
( c-((7-109^(1/2))/(-6)) )
c-((7-109^(1/2))/(-6)) = 0 // + (7-109^(1/2))/(-6)
c = (7-109^(1/2))/(-6)
c in { (109^(1/2)+7)/(-6), (7-109^(1/2))/(-6) }
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