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b in (-oo:+oo)
(4/16)*b = 6/26 // - 6/26
(4/16)*b-(6/26) = 0
(4/16)*b-3/13 = 0
1/4*b-3/13 = 0 // + 3/13
1/4*b = 3/13 // : 1/4
b = 3/13/1/4
b = 12/13
b = 12/13
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