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b in (-oo:+oo)
4*(2*b+9) = 52 // - 52
4*(2*b+9)-52 = 0
4*(2*b+9)-52 = 0
8*b-16 = 0
8*b-16 = 0
8*b-16 = 0 // + 16
8*b = 16 // : 8
b = 16/8
b = 2
b = 2
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