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s in (-oo:+oo)
-12 = (7*s)/3-5 // - (7*s)/3-5
5-((7*s)/3)-12 = 0
(-7/3)*s-12+5 = 0
-7/3*s-7 = 0 // + 7
-7/3*s = 7 // : -7/3
s = 7/(-7/3)
s = -3
s = -3
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