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c in (-oo:+oo)
(0.85*c)/(-0.5)-9.6 = 0
-1.7*c-9.6 = 0 // + 9.6
-1.7*c = 9.6 // : -1.7
c = 9.6/(-1.7)
c = -5.64705882
c = -5.64705882
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