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s in (-oo:+oo)
8*s^2-(13*s)+3/2 = 0
8*s^2-13*s+3/2 = 0
8*s^2-13*s+3/2 = 0
DELTA = (-13)^2-(3/2*4*8)
DELTA = 121
DELTA > 0
s = (121^(1/2)+13)/(2*8) or s = (13-121^(1/2))/(2*8)
s = 3/2 or s = 1/8
s in { 1/8, 3/2 }
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