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c in (-oo:+oo)
-8/10 = c/10 // - c/10
-(c/10)-8/10 = 0
-1/10*c-4/5 = 0 // + 4/5
-1/10*c = 4/5 // : -1/10
c = 4/5/(-1/10)
c = -8
c = -8
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