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s in (-oo:+oo)
(4.89*s)/0.3 = 47.9 // - 47.9
(4.89*s)/0.3-47.9 = 0
16.3*s-47.9 = 0 // + 47.9
16.3*s = 47.9 // : 16.3
s = 47.9/16.3
s = 2.93865031
s = 2.93865031
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