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c in (-oo:+oo)
(2-6*c)/5 = 4*c // - 4*c
(2-6*c)/5-(4*c) = 0
(2-6*c)/5-4*c = 0
(2-6*c)/5+(-4*5*c)/5 = 0
2-6*c-4*5*c = 0
2-26*c = 0
(2-26*c)/5 = 0
(2-26*c)/5 = 0 // * 5
2-26*c = 0
2-26*c = 0 // - 2
-26*c = -2 // : -26
c = -2/(-26)
c = 1/13
c = 1/13
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