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s in (-oo:+oo)
s/6+9 = 8.5 // - 8.5
s/6-8.5+9 = 0
1/6*s+0.5 = 0 // - 0.5
1/6*s = -0.5 // : 1/6
s = -0.5/1/6
s = -2.99999994
s = -2.99999994
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