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D( s )
230-s = 0
s+230 = 0
230-s = 0
230-s = 0
230-s = 0 // - 230
-s = -230 // * -1
s = 230
s+230 = 0
s+230 = 0
s+230 = 0 // - 230
s = -230
s in (-oo:-230) U (-230:230) U (230:+oo)
560/(s+230) = 360/(230-s) // - 360/(230-s)
560/(s+230)-(360/(230-s)) = 0
560/(s+230)-360*(230-s)^-1 = 0
560/(s+230)-360/(230-s) = 0
(560*(230-s))/((s+230)*(230-s))+(-360*(s+230))/((s+230)*(230-s)) = 0
560*(230-s)-360*(s+230) = 0
46000-920*s = 0
(46000-920*s)/((s+230)*(230-s)) = 0
(46000-920*s)/((s+230)*(230-s)) = 0 // * (s+230)*(230-s)
46000-920*s = 0
46000-920*s = 0 // - 46000
-920*s = -46000 // : -920
s = -46000/(-920)
s = 50
s = 50
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