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b in (-oo:+oo)
4*b+8 = 24-4*b // - 24-4*b
4*b-(-4*b)-24+8 = 0
4*b+4*b-24+8 = 0
8*b-16 = 0 // + 16
8*b = 16 // : 8
b = 16/8
b = 2
b = 2
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