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b in (-oo:+oo)
(1/2)*(6*b-4) = (2/3)*(b+9)+(1/3)*b // - (2/3)*(b+9)+(1/3)*b
(1/2)*(6*b-4)-((2/3)*(b+9))-((1/3)*b) = 0
(1/2)*(6*b-4)+(-2/3)*(b+9)+(-1/3)*b = 0
1/2*(6*b-4)-2/3*(b+9)-b/3 = 0
(1/2*3*(6*b-4))/3+(-2/3*3*(b+9))/3-b/3 = 0
1/2*3*(6*b-4)-2/3*3*(b+9)-b = 0
7*b-b-24 = 0
6*b-24 = 0
(6*b-24)/3 = 0
(6*b-24)/3 = 0 // * 3
6*b-24 = 0
6*b-24 = 0 // + 24
6*b = 24 // : 6
b = 24/6
b = 4
b = 4
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