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b in (-oo:+oo)
b+9 = 4*b-(3/4) // - 4*b-(3/4)
b-(4*b)+3/4+9 = 0
b-4*b+3/4+9 = 0
39/4-3*b = 0 // - 39/4
-3*b = -39/4 // : -3
b = -39/4/(-3)
b = 13/4
b = 13/4
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