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b in (-oo:+oo)
b/16 = 30/20 // - 30/20
b/16-(30/20) = 0
b/16-3/2 = 0
1/16*b-3/2 = 0 // + 3/2
1/16*b = 3/2 // : 1/16
b = 3/2/1/16
b = 24
b = 24
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