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s in (-oo:+oo)
(-4/5)*s = 2 // - 2
(-4/5)*s-2 = 0
-4/5*s-2 = 0 // + 2
-4/5*s = 2 // : -4/5
s = 2/(-4/5)
s = -5/2
s = -5/2
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