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c in (-oo:+oo)
(4/5)*c-(2/7) = 5 // - 5
(4/5)*c-(2/7)-5 = 0
(4/5)*c-2/7-5 = 0
4/5*c-37/7 = 0 // + 37/7
4/5*c = 37/7 // : 4/5
c = 37/7/4/5
c = 185/28
c = 185/28
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