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s in (-oo:+oo)
(7/8)*s-((6/7)*s) = 1/28 // - 1/28
(7/8)*s-((6/7)*s)-(1/28) = 0
(7/8)*s+(-6/7)*s-1/28 = 0
1/56*s-1/28 = 0 // + 1/28
1/56*s = 1/28 // : 1/56
s = 1/28/1/56
s = 2
s = 2
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