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s in (-oo:+oo)
6 = 89*s-(3/40)-20 // - 89*s-(3/40)-20
3/40-(89*s)+6+20 = 0
3/40-89*s+6+20 = 0
1043/40-89*s = 0 // - 1043/40
-89*s = -1043/40 // : -89
s = -1043/40/(-89)
s = 1043/3560
s = 1043/3560
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