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b in (-oo:+oo)
b+9 = 5*b-39 // - 5*b-39
b-(5*b)+9+39 = 0
b-5*b+9+39 = 0
48-4*b = 0 // - 48
-4*b = -48 // : -4
b = -48/(-4)
b = 12
b = 12
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