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D( b )
b^2 = 0
b^2 = 0
b^2 = 0
1*b^2 = 0 // : 1
b^2 = 0
b = 0
b in (-oo:0) U (0:+oo)
14*b-(14*b)+(2*b)/(b^2)-(14/(b^2))-49+49 = 0
14*b-14*b+(2*b)/(b^2)-14*b^-2-49+49 = 0
2*b^-1-14*b^-2 = 0
t_1 = b^-1
2*t_1^1-14*t_1^2 = 0
2*t_1-14*t_1^2 = 0
DELTA = 2^2-(-14*0*4)
DELTA = 4
DELTA > 0
t_1 = (4^(1/2)-2)/(-14*2) or t_1 = (-4^(1/2)-2)/(-14*2)
t_1 = 0 or t_1 = 1/7
t_1 = 0
b^-1+0 = 0
b^-1 = 0
1*b^-1 = 0 // : 1
b^-1 = 0
b naleu017Cy do O
t_1 = 1/7
b^-1-1/7 = 0
1*b^-1 = 1/7 // : 1
b^-1 = 1/7
-1 < 0
1/(b^1) = 1/7 // * b^1
1 = 1/7*b^1 // : 1/7
7 = b^1
b = 7
b = 7
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