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b in (-oo:+oo)
4*b+9 = 33/5 // - 33/5
4*b-(33/5)+9 = 0
4*b-33/5+9 = 0
4*b+12/5 = 0 // - 12/5
4*b = -12/5 // : 4
b = -12/5/4
b = -3/5
b = -3/5
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