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c in (-oo:+oo)
(13/15)*c+(1/5)*c = 5/8 // - 5/8
(13/15)*c+(1/5)*c-(5/8) = 0
(13/15)*c+(1/5)*c-5/8 = 0
16/15*c-5/8 = 0 // + 5/8
16/15*c = 5/8 // : 16/15
c = 5/8/16/15
c = 75/128
c = 75/128
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