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b in (-oo:+oo)
(1/2)*b+4/5 = 103/110 // - 103/110
(1/2)*b+4/5-(103/110) = 0
(1/2)*b+4/5-103/110 = 0
1/2*b-3/22 = 0 // + 3/22
1/2*b = 3/22 // : 1/2
b = 3/22/1/2
b = 3/11
b = 3/11
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