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s in (-oo:+oo)
3*s-(14/4) = 4 // - 4
3*s-(14/4)-4 = 0
3*s-7/2-4 = 0
3*s-15/2 = 0 // + 15/2
3*s = 15/2 // : 3
s = 15/2/3
s = 5/2
s = 5/2
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