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s in (-oo:+oo)
(s+3)/3-((s-3)/49) = 1 // - 1
(s+3)/3-((s-3)/49)-1 = 0
(s+3)/3+(-1*(s-3))/49-1 = 0
(49*(s+3))/(3*49)+(-1*3*(s-3))/(3*49)+(-1*3*49)/(3*49) = 0
49*(s+3)-1*3*(s-3)-1*3*49 = 0
46*s-147+156 = 0
46*s+9 = 0
(46*s+9)/(3*49) = 0
(46*s+9)/(3*49) = 0 // * 3*49
46*s+9 = 0
46*s+9 = 0 // - 9
46*s = -9 // : 46
s = -9/46
s = -9/46
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