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c in (-oo:+oo)
6 = 13-((6/5)*c) // - 13-((6/5)*c)
(6/5)*c-13+6 = 0
6/5*c-7 = 0 // + 7
6/5*c = 7 // : 6/5
c = 7/6/5
c = 35/6
c = 35/6
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