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c in (-oo:+oo)
-5*(c/4) = 4 // - 4
-5*(c/4)-4 = 0
-5/4*c-4 = 0 // + 4
-5/4*c = 4 // : -5/4
c = 4/(-5/4)
c = -16/5
c = -16/5
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