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c in (-oo:+oo)
(6*c-3.6)/4 = -4/5 // + -4/5
(6*c-3.6)/4-(-4/5) = 0
(6*c-3.6)/4+4/5 = 0
(5*(6*c-3.6))/(4*5)+(4^2)/(4*5) = 0
5*(6*c-3.6)+16 = 0
30*c-2 = 0
(30*c-2)/(4*5) = 0
(30*c-2)/(4*5) = 0 // * 4*5
30*c-2 = 0
30*c-2 = 0 // + 2
30*c = 2 // : 30
c = 2/30
c = 1/15
c = 1/15
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