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c in (-oo:+oo)
(4*c-20)/4-(6*(c-1)) = 0
(4*c-20)/4-6*(c-1) = 0
(4*c-20)/4+(-6*4*(c-1))/4 = 0
4*c-6*4*(c-1)-20 = 0
4-20*c = 0
(4-20*c)/4 = 0
(4-20*c)/4 = 0 // * 4
4-20*c = 0
4-20*c = 0 // - 4
-20*c = -4 // : -20
c = -4/(-20)
c = 1/5
c = 1/5
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