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b in (-oo:+oo)
23/10 = 4*b-b+4/5 // - 4*b-b+4/5
b-(4*b)+23/10-(4/5) = 0
b-4*b+23/10-4/5 = 0
3/2-3*b = 0 // - 3/2
-3*b = -3/2 // : -3
b = -3/2/(-3)
b = 1/2
b = 1/2
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