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s in (-oo:+oo)
-1 = (s-973)/(-21) // - (s-973)/(-21)
-((s-973)/(-21))-1 = 0
(-1*(s-973))/(-21)-1 = 0
(-1*(s-973))/(-21)+(-21*(-1))/(-21) = 0
-1*(s-973)-21*(-1) = 0
994-s = 0
(994-s)/(-21) = 0
(994-s)/(-21) = 0 // * -21
994-s = 0
994-s = 0 // - 994
-s = -994 // * -1
s = 994
s = 994
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