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s in (-oo:+oo)
-12 = -((7/2)*s)-7 // + -((7/2)*s)-7
(7/2)*s-12+7 = 0
7/2*s-5 = 0 // + 5
7/2*s = 5 // : 7/2
s = 5/7/2
s = 10/7
s = 10/7
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