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c in (-oo:+oo)
-((3*c)/8) = 6 // - 6
-((3*c)/8)-6 = 0
(-3/8)*c-6 = 0
-3/8*c-6 = 0 // + 6
-3/8*c = 6 // : -3/8
c = 6/(-3/8)
c = -16
c = -16
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