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c in (-oo:+oo)
(7^1)/3 = c-(4/5) // - c-(4/5)
(7^1)/3-c+4/5 = 0
7/3-c+4/5 = 0
47/15-c = 0 // - 47/15
-c = -47/15 // * -1
c = 47/15
c = 47/15
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