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s in (-oo:+oo)
(1/2)*(1*s+5/9) = 31/63 // - 31/63
(1/2)*(1*s+5/9)-(31/63) = 0
(1/2)*(s+5/9)-31/63 = 0
1/2*(s+5/9)-31/63 = 0
(1/2*63*(s+5/9))/63-31/63 = 0
1/2*63*(s+5/9)-31 = 0
63/2*s-27/2 = 0
(63/2*s-27/2)/63 = 0
(63/2*s-27/2)/63 = 0 // * 63
63/2*s-27/2 = 0
63/2*s-27/2 = 0 // + 27/2
63/2*s = 27/2 // : 63/2
s = 27/2/63/2
s = 3/7
s = 3/7
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