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c in (-oo:+oo)
(5/6)*c+4/15 = 7/10 // - 7/10
(5/6)*c+4/15-(7/10) = 0
(5/6)*c+4/15-7/10 = 0
5/6*c-13/30 = 0 // + 13/30
5/6*c = 13/30 // : 5/6
c = 13/30/5/6
c = 13/25
c = 13/25
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