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b in (-oo:+oo)
(4/5)*b-(1/2) = 83/10 // - 83/10
(4/5)*b-(1/2)-(83/10) = 0
(4/5)*b-1/2-83/10 = 0
4/5*b-44/5 = 0 // + 44/5
4/5*b = 44/5 // : 4/5
b = 44/5/4/5
b = 11
b = 11
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