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c in (-oo:+oo)
(3-15*c)/6 = 12 // - 12
(3-15*c)/6-12 = 0
(3-15*c)/6+(-12*6)/6 = 0
3-15*c-12*6 = 0
-15*c-69 = 0
(-15*c-69)/6 = 0
(-15*c-69)/6 = 0 // * 6
-15*c-69 = 0
-15*c-69 = 0 // + 69
-15*c = 69 // : -15
c = 69/(-15)
c = -23/5
c = -23/5
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