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s in (-oo:+oo)
(6/7)*s-((5/6)*s) = 4/21 // - 4/21
(6/7)*s-((5/6)*s)-(4/21) = 0
(6/7)*s+(-5/6)*s-4/21 = 0
1/42*s-4/21 = 0 // + 4/21
1/42*s = 4/21 // : 1/42
s = 4/21/1/42
s = 8
s = 8
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