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s in (-oo:+oo)
5/6-((2/3)*s) = 3/4 // - 3/4
5/6-((2/3)*s)-(3/4) = 0
(-2/3)*s+5/6-3/4 = 0
1/12-2/3*s = 0 // - 1/12
-2/3*s = -1/12 // : -2/3
s = -1/12/(-2/3)
s = 1/8
s = 1/8
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