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s in (-oo:+oo)
(21/2)*s+20*s = 48 // - 48
(21/2)*s+20*s-48 = 0
61/2*s-48 = 0 // + 48
61/2*s = 48 // : 61/2
s = 48/61/2
s = 96/61
s = 96/61
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