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c in (-oo:+oo)
(-5*c)/16 = 3 // - 3
(-5*c)/16-3 = 0
-5/16*c-3 = 0 // + 3
-5/16*c = 3 // : -5/16
c = 3/(-5/16)
c = -48/5
c = -48/5
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