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b in (-oo:+oo)
(1/5)*b = 8/5 // - 8/5
(1/5)*b-(8/5) = 0
(1/5)*b-8/5 = 0
1/5*b-8/5 = 0 // + 8/5
1/5*b = 8/5 // : 1/5
b = 8/5/1/5
b = 8
b = 8
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