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D( b )
b = 0
b = 0
b = 0
b in (-oo:0) U (0:+oo)
(2/b-3.4)/0.6 = -29 // + 29
(2/b-3.4)/0.6+29 = 0
(2*b^-1-3.4)/0.6+29 = 0
(2*b^-1-3.4)/0.6+(0.6*29)/0.6 = 0
2*b^-1+0.6*29-3.4 = 0
2*b^-1+14 = 0
(2*b^-1+14)/0.6 = 0
(2*b^-1+14)/0.6 = 0 // * 0.6
2*b^-1+14 = 0
2*b^-1 = -14 // : 2
b^-1 = -7
-1 < 0
1/(b^1) = -7 // * b^1
1 = -7*b^1 // : -7
-1/7 = b^1
b = -1/7
b = -1/7
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