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b in (-oo:+oo)
8-7*b = -2*b-17 // + -2*b-17
8-7*b-(-2*b)+17 = 0
2*b-7*b+8+17 = 0
25-5*b = 0 // - 25
-5*b = -25 // : -5
b = -25/(-5)
b = 5
b = 5
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