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c in (-oo:+oo)
2/3 = c+5/1 // - c+5/1
2/3-c-(5/1) = 0
2/3-c-5 = 0
-c-13/3 = 0 // + 13/3
-c = 13/3 // * -1
c = -13/3
c = -13/3
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