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s in (-oo:+oo)
2.5/3.33 = s/4.25 // - s/4.25
2.5/3.33-(s/4.25) = 0
2.5/3.33-0.23529412*s = 0
0.75075075-0.23529412*s = 0 // - 0.75075075
-0.23529412*s = -0.75075075 // : -0.23529412
s = -0.75075075/(-0.23529412)
s = 3.19069066
s = 3.19069066
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