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D( b )
2*b^3-(50*b) = 0
2*b^3-(50*b) = 0
2*b^3-(50*b) = 0
2*b^3-50*b = 0
2*b^3-50*b = 0
2*b*(b^2-25) = 0
1*b^2 = 25 // : 1
b^2 = 25
b^2 = 25 // ^ 1/2
abs(b) = 5
b = 5 or b = -5
2*b = 0
2*b = 0 // : 2
b = 0
b in (-oo:-5) U (-5:0) U (0:5) U (5:+oo)
(3*b^2+15*b)/(2*b^3-(50*b)) = 0
(3*b^2+15*b)/(2*b^3-50*b) = 0
3*b^2+15*b = 0
3*b*(b+5) = 0
b+5 = 0 // - 5
b = -5
3*b*(b+5) = 0
2*b^3-50*b = 0
2*b*(b^2-25) = 0
1*b^2 = 25 // : 1
b^2 = 25
b^2 = 25 // ^ 1/2
abs(b) = 5
b = 5 or b = -5
2*b*(b-5)*(b+5) = 0
(3*b*(b+5))/(2*b*(b-5)*(b+5)) = 0
( 3*b )
3*b = 0 // : 3
b = 0
( b+5 )
b+5 = 0 // - 5
b = -5
b in { 0}
b in { -5}
b belongs to the empty set
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