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b in (-oo:+oo)
(1/3)*(b+12)-((1/4)*(b+12)) = 0
(1/3)*(b+12)+(-1/4)*(b+12) = 0
1/3*(b+12)-1/4*(b+12) = 0
1/3*(b+12)-1/4*(b+12) = 0
1/12*b+1 = 0
1/12*b+1 = 0
1/12*b+1 = 0 // - 1
1/12*b = -1 // : 1/12
b = -1/1/12
b = -12
b = -12
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