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c in (-oo:+oo)
(8/5)*c-8 = 12 // - 12
(8/5)*c-12-8 = 0
8/5*c-20 = 0 // + 20
8/5*c = 20 // : 8/5
c = 20/8/5
c = 25/2
c = 25/2
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