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D( b )
6*b-16 = 0
6*b-16 = 0
6*b-16 = 0
6*b-16 = 0 // + 16
6*b = 16 // : 6
b = 16/6
b = 8/3
b in (-oo:8/3) U (8/3:+oo)
b^2 = (6*b)/(6*b-16) // - (6*b)/(6*b-16)
b^2-((6*b)/(6*b-16)) = 0
b^2-6*b*(6*b-16)^-1 = 0
(-6*b)/(6*b-16)+b^2 = 0
(-6*b)/(6*b-16)+(b^2*(6*b-16))/(6*b-16) = 0
b^2*(6*b-16)-6*b = 0
6*b^3-16*b^2-6*b = 0
6*b^3-16*b^2-6*b = 0
2*b*(3*b^2-8*b-3) = 0
3*b^2-8*b-3 = 0
DELTA = (-8)^2-(-3*3*4)
DELTA = 100
DELTA > 0
b = (100^(1/2)+8)/(2*3) or b = (8-100^(1/2))/(2*3)
b = 3 or b = -1/3
2*b*(b+1/3)*(b-3) = 0
(2*b*(b+1/3)*(b-3))/(6*b-16) = 0
(2*b*(b+1/3)*(b-3))/(6*b-16) = 0 // * 6*b-16
2*b*(b+1/3)*(b-3) = 0
( 2*b )
2*b = 0 // : 2
b = 0
( b+1/3 )
b+1/3 = 0 // - 1/3
b = -1/3
( b-3 )
b-3 = 0 // + 3
b = 3
b in { 0, -1/3, 3 }
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