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c in (-oo:+oo)
-10.5 = c/(-3.2) // - c/(-3.2)
-(c/(-3.2))-10.5 = 0
0.3125*c-10.5 = 0
0.3125*c-10.5 = 0 // + 10.5
0.3125*c = 10.5 // : 0.3125
c = 10.5/0.3125
c = 33.6
c = 33.6
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