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s in (-oo:+oo)
3/14 = (s-2)/21 // - (s-2)/21
3/14-((s-2)/21) = 0
(-1*(s-2))/21+3/14 = 0
(-1*14*(s-2))/(14*21)+(3*21)/(14*21) = 0
3*21-1*14*(s-2) = 0
91-14*s = 0
(91-14*s)/(14*21) = 0
(91-14*s)/(14*21) = 0 // * 14*21
91-14*s = 0
91-14*s = 0 // - 91
-14*s = -91 // : -14
s = -91/(-14)
s = 13/2
s = 13/2
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