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s in (-oo:+oo)
3*s+7 = 5/2 // - 5/2
3*s-(5/2)+7 = 0
3*s-5/2+7 = 0
3*s+9/2 = 0 // - 9/2
3*s = -9/2 // : 3
s = -9/2/3
s = -3/2
s = -3/2
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