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b in (-oo:+oo)
19/5 = 5*b-3*b-(1/5) // - 5*b-3*b-(1/5)
19/5-(-3*b)-(5*b)+1/5 = 0
3*b-5*b+19/5+1/5 = 0
4-2*b = 0 // - 4
-2*b = -4 // : -2
b = -4/(-2)
b = 2
b = 2
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