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c in (-oo:+oo)
5*(c+4/5)-20 = 0
5*(c+4/5)-20 = 0
5*c-16 = 0
5*c-16 = 0
5*c-16 = 0 // + 16
5*c = 16 // : 5
c = 16/5
c = 16/5
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