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c in (-oo:+oo)
c+5 = (4/5)*c+18 // - (4/5)*c+18
c-((4/5)*c)-18+5 = 0
c+(-4/5)*c-18+5 = 0
1/5*c-13 = 0 // + 13
1/5*c = 13 // : 1/5
c = 13/1/5
c = 65
c = 65
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