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b in (-oo:+oo)
11/16 = b/20 // - b/20
11/16-(b/20) = 0
11/16-1/20*b = 0 // - 11/16
-1/20*b = -11/16 // : -1/20
b = -11/16/(-1/20)
b = 55/4
b = 55/4
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