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b in (-oo:+oo)
11.3 > b/4.3 // - b/4.3
11.3-(b/4.3) > 0
11.3-0.23255814*b > 0
11.3-0.23255814*b > 0 // - 11.3
-0.23255814*b > -11.3 // : -0.23255814
b < -11.3/(-0.23255814)
b < 48.5899999
b in (-oo:48.5899999)
(-oo:48.5899999)
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