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b in (-oo:+oo)
(3/4)*b+(5/12)*b-(2/3) = -3 // + 3
(3/4)*b+(5/12)*b-(2/3)+3 = 0
(3/4)*b+(5/12)*b-2/3+3 = 0
7/6*b+7/3 = 0 // - 7/3
7/6*b = -7/3 // : 7/6
b = -7/3/7/6
b = -2
b = -2
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