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c in (-oo:+oo)
4*c-(10/2) = 45 // - 45
4*c-(10/2)-45 = 0
4*c-45-5 = 0
4*c-50 = 0 // + 50
4*c = 50 // : 4
c = 50/4
c = 25/2
c = 25/2
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