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b in (-oo:+oo)
5*b+4/5 = 33/10 // - 33/10
5*b+4/5-(33/10) = 0
5*b+4/5-33/10 = 0
5*b-5/2 = 0 // + 5/2
5*b = 5/2 // : 5
b = 5/2/5
b = 1/2
b = 1/2
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