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s in (-oo:+oo)
-12 = (-7/2)*s // - (-7/2)*s
-((-7/2)*s)-12 = 0
(7/2)*s-12 = 0
7/2*s-12 = 0 // + 12
7/2*s = 12 // : 7/2
s = 12/7/2
s = 24/7
s = 24/7
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