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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
2/b+9/10 = 3/5 // - 3/5
2/b+9/10-(3/5) = 0
2/b+9/10-3/5 = 0
2*b^-1 = -3/10 // : 2
b^-1 = -3/20
-1 < 0
1/(b^1) = -3/20 // * b^1
1 = -3/20*b^1 // : -3/20
-20/3 = b^1
b = -20/3
b = -20/3
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