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c in (-oo:+oo)
2/5 = c/145 // - c/145
2/5-(c/145) = 0
2/5-1/145*c = 0 // - 2/5
-1/145*c = -2/5 // : -1/145
c = -2/5/(-1/145)
c = 58
c = 58
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