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c in (-oo:+oo)
(2/13)*c = 21/10 // - 21/10
(2/13)*c-(21/10) = 0
(2/13)*c-21/10 = 0
2/13*c-21/10 = 0 // + 21/10
2/13*c = 21/10 // : 2/13
c = 21/10/2/13
c = 273/20
c = 273/20
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