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s in (-oo:+oo)
-11 = s/5+19 // - s/5+19
-(s/5)-19-11 = 0
-1/5*s-30 = 0 // + 30
-1/5*s = 30 // : -1/5
s = 30/(-1/5)
s = -150
s = -150
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