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b in (-oo:+oo)
-(2*b)-1 = 7*b-73 // - 7*b-73
73-(2*b)-(7*b)-1 = 0
73-2*b-7*b-1 = 0
72-9*b = 0 // - 72
-9*b = -72 // : -9
b = -72/(-9)
b = 8
b = 8
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