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b in (-oo:+oo)
17 = 5*b-3*b-5 // - 5*b-3*b-5
5-(-3*b)-(5*b)+17 = 0
3*b-5*b+5+17 = 0
22-2*b = 0 // - 22
-2*b = -22 // : -2
b = -22/(-2)
b = 11
b = 11
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