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c in (-oo:+oo)
5/8 = 3*c-(3/8) // - 3*c-(3/8)
5/8-(3*c)+3/8 = 0
5/8-3*c+3/8 = 0
1-3*c = 0 // - 1
-3*c = -1 // : -3
c = -1/(-3)
c = 1/3
c = 1/3
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