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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
24 = 480/b // - 480/b
24-(480/b) = 0
24-480*b^-1 = 0
-480*b^-1 = -24 // : -480
b^-1 = 1/20
-1 < 0
1/(b^1) = 1/20 // * b^1
1 = 1/20*b^1 // : 1/20
20 = b^1
b = 20
b = 20
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