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c in (-oo:+oo)
(7/10)*c-10 = 2/5 // - 2/5
(7/10)*c-(2/5)-10 = 0
(7/10)*c-2/5-10 = 0
7/10*c-52/5 = 0 // + 52/5
7/10*c = 52/5 // : 7/10
c = 52/5/7/10
c = 104/7
c = 104/7
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