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D( b )
3*b-2 = 0
3*b+2 = 0
3*b-2 = 0
3*b-2 = 0
3*b-2 = 0 // + 2
3*b = 2 // : 3
b = 2/3
3*b+2 = 0
3*b+2 = 0
3*b+2 = 0 // - 2
3*b = -2 // : 3
b = -2/3
b in (-oo:-2/3) U (-2/3:2/3) U (2/3:+oo)
4/(3*b-2)-(7/(3*b+2)) = 0
4/(3*b-2)-7*(3*b+2)^-1 = 0
4/(3*b-2)-7/(3*b+2) = 0
(4*(3*b+2))/((3*b-2)*(3*b+2))+(-7*(3*b-2))/((3*b-2)*(3*b+2)) = 0
4*(3*b+2)-7*(3*b-2) = 0
22-9*b = 0
(22-9*b)/((3*b-2)*(3*b+2)) = 0
(22-9*b)/((3*b-2)*(3*b+2)) = 0 // * (3*b-2)*(3*b+2)
22-9*b = 0
22-9*b = 0 // - 22
-9*b = -22 // : -9
b = -22/(-9)
b = 22/9
b = 22/9
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