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c in (-oo:+oo)
c/5-c-(1/10) = 9/10 // - 9/10
c/5-c-(1/10)-(9/10) = 0
c/5-c-1/10-9/10 = 0
-4/5*c-1 = 0 // + 1
-4/5*c = 1 // : -4/5
c = 1/(-4/5)
c = -5/4
c = -5/4
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