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s in (-oo:+oo)
(8/9)*s+20 = -26 // + 26
(8/9)*s+20+26 = 0
8/9*s+46 = 0 // - 46
8/9*s = -46 // : 8/9
s = -46/8/9
s = -207/4
s = -207/4
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