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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
15*(3/b) = 45/b // - 45/b
15*(3/b)-(45/b) = 0
15*(3/b)-45*b^-1 = 0
0 = 0
b naleu017Cy do R
b in (-oo:0) U (0:+oo)
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