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