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