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b in (-oo:+oo)
2*b+9 = 7*b-1 // - 7*b-1
2*b-(7*b)+1+9 = 0
2*b-7*b+1+9 = 0
10-5*b = 0 // - 10
-5*b = -10 // : -5
b = -10/(-5)
b = 2
b = 2
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