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c in (-oo:+oo)
3*c+4/5 = (1/2)*c+1 // - (1/2)*c+1
3*c-((1/2)*c)+4/5-1 = 0
3*c+(-1/2)*c+4/5-1 = 0
5/2*c-1/5 = 0 // + 1/5
5/2*c = 1/5 // : 5/2
c = 1/5/5/2
c = 2/25
c = 2/25
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