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s in (-oo:+oo)
-((7/2)*s)-7 = 12 // - 12
-((7/2)*s)-12-7 = 0
(-7/2)*s-12-7 = 0
-7/2*s-19 = 0 // + 19
-7/2*s = 19 // : -7/2
s = 19/(-7/2)
s = -38/7
s = -38/7
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