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c in (-oo:+oo)
2/5-((1/5)*c)+4 = -9 // + 9
2/5-((1/5)*c)+4+9 = 0
(-1/5)*c+2/5+4+9 = 0
67/5-1/5*c = 0 // - 67/5
-1/5*c = -67/5 // : -1/5
c = -67/5/(-1/5)
c = 67
c = 67
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