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