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b in (-oo:+oo)
(3/4)*b-(5/12) = 4/12 // - 4/12
(3/4)*b-(5/12)-(4/12) = 0
(3/4)*b-5/12-1/3 = 0
3/4*b-3/4 = 0 // + 3/4
3/4*b = 3/4 // : 3/4
b = 3/4/3/4
b = 1
b = 1
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