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s in (-oo:+oo)
(5/6)*s-((4/5)*s) = 1/15 // - 1/15
(5/6)*s-((4/5)*s)-(1/15) = 0
(5/6)*s+(-4/5)*s-1/15 = 0
1/30*s-1/15 = 0 // + 1/15
1/30*s = 1/15 // : 1/30
s = 1/15/1/30
s = 2
s = 2
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