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c in (-oo:+oo)
-61/4 = (3/5)*c // - (3/5)*c
-((3/5)*c)-61/4 = 0
(-3/5)*c-61/4 = 0
-3/5*c-61/4 = 0 // + 61/4
-3/5*c = 61/4 // : -3/5
c = 61/4/(-3/5)
c = -305/12
c = -305/12
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