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s in (-oo:+oo)
(71/2)*s+9 = (1/2)*s+36 // - (1/2)*s+36
(71/2)*s-((1/2)*s)-36+9 = 0
(71/2)*s+(-1/2)*s-36+9 = 0
35*s-27 = 0 // + 27
35*s = 27 // : 35
s = 27/35
s = 27/35
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