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s in (-oo:+oo)
1/12-(7*s) = 18 // - 18
1/12-(7*s)-18 = 0
1/12-7*s-18 = 0
-7*s-215/12 = 0 // + 215/12
-7*s = 215/12 // : -7
s = 215/12/(-7)
s = -215/84
s = -215/84
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