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c in (-oo:+oo)
-12/5 = 15*c // - 15*c
-(15*c)-12/5 = 0
-15*c-12/5 = 0
-15*c-12/5 = 0 // + 12/5
-15*c = 12/5 // : -15
c = 12/5/(-15)
c = -4/25
c = -4/25
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