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c in (-oo:+oo)
(-4/5)*c = 1 // - 1
(-4/5)*c-1 = 0
-4/5*c-1 = 0 // + 1
-4/5*c = 1 // : -4/5
c = 1/(-4/5)
c = -5/4
c = -5/4
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