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b in (-oo:+oo)
b/5-b-(1/10) = 9/10 // - 9/10
b/5-b-(1/10)-(9/10) = 0
b/5-b-1/10-9/10 = 0
-4/5*b-1 = 0 // + 1
-4/5*b = 1 // : -4/5
b = 1/(-4/5)
b = -5/4
b = -5/4
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