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c in (-oo:+oo)
(13/15)*c+(1/5)*c = 1/4 // - 1/4
(13/15)*c+(1/5)*c-(1/4) = 0
(13/15)*c+(1/5)*c-1/4 = 0
16/15*c-1/4 = 0 // + 1/4
16/15*c = 1/4 // : 16/15
c = 1/4/16/15
c = 15/64
c = 15/64
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