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c in (-oo:+oo)
1/2 = (2/5)*(c-3) // - (2/5)*(c-3)
1/2-((2/5)*(c-3)) = 0
(-2/5)*(c-3)+1/2 = 0
1/2-2/5*(c-3) = 0
(-2/5*2*(c-3))/2+1/2 = 0
1-2/5*2*(c-3) = 0
17/5-4/5*c = 0
(17/5-4/5*c)/2 = 0
(17/5-4/5*c)/2 = 0 // * 2
17/5-4/5*c = 0
17/5-4/5*c = 0 // - 17/5
-4/5*c = -17/5 // : -4/5
c = -17/5/(-4/5)
c = 17/4
c = 17/4
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