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b in (-oo:+oo)
(1/2)*b+10/9 = 25/9 // - 25/9
(1/2)*b+10/9-(25/9) = 0
(1/2)*b+10/9-25/9 = 0
1/2*b-5/3 = 0 // + 5/3
1/2*b = 5/3 // : 1/2
b = 5/3/1/2
b = 10/3
b = 10/3
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