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s in (-oo:+oo)
(7/4)*(s+3) = 1/4-s // - 1/4-s
(7/4)*(s+3)+s-(1/4) = 0
(7/4)*(s+3)+s-1/4 = 0
7/4*(s+3)+s-1/4 = 0
(7/4*4*(s+3))/4+(4*s)/4-1/4 = 0
7/4*4*(s+3)+4*s-1 = 0
11*s-1+21 = 0
11*s+20 = 0
(11*s+20)/4 = 0
(11*s+20)/4 = 0 // * 4
11*s+20 = 0
11*s+20 = 0 // - 20
11*s = -20 // : 11
s = -20/11
s = -20/11
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