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c in (-oo:+oo)
(2/3)*c = 13/10 // - 13/10
(2/3)*c-(13/10) = 0
(2/3)*c-13/10 = 0
2/3*c-13/10 = 0 // + 13/10
2/3*c = 13/10 // : 2/3
c = 13/10/2/3
c = 39/20
c = 39/20
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