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