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c in (-oo:+oo)
-5*c-(12/4) = 2 // - 2
-5*c-(12/4)-2 = 0
-5*c-3-2 = 0
-5*c-5 = 0 // + 5
-5*c = 5 // : -5
c = 5/(-5)
c = -1
c = -1
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