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c in (-oo:+oo)
2/3 = c+4/5 // - c+4/5
2/3-c-(4/5) = 0
2/3-c-4/5 = 0
-c-2/15 = 0 // + 2/15
-c = 2/15 // * -1
c = -2/15
c = -2/15
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