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s in (-oo:+oo)
(2/3)*s+4 = 23 // - 23
(2/3)*s-23+4 = 0
2/3*s-19 = 0 // + 19
2/3*s = 19 // : 2/3
s = 19/2/3
s = 57/2
s = 57/2
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