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c in (-oo:+oo)
2-((5*c)/8) = 5 // - 5
2-((5*c)/8)-5 = 0
(-5/8)*c-5+2 = 0
-5/8*c-3 = 0 // + 3
-5/8*c = 3 // : -5/8
c = 3/(-5/8)
c = -24/5
c = -24/5
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