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b in (-oo:+oo)
(1/3)*(b+6) = (1/4)*b // - (1/4)*b
(1/3)*(b+6)-((1/4)*b) = 0
(1/3)*(b+6)+(-1/4)*b = 0
1/3*(b+6)-b/4 = 0
(1/3*4*(b+6))/4-b/4 = 0
1/3*4*(b+6)-b = 0
1/3*b+8 = 0
(1/3*b+8)/4 = 0
(1/3*b+8)/4 = 0 // * 4
1/3*b+8 = 0
1/3*b+8 = 0 // - 8
1/3*b = -8 // : 1/3
b = -8/1/3
b = -24
b = -24
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