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b in (-oo:+oo)
4*(6*b-6) = 240 // - 240
4*(6*b-6)-240 = 0
4*(6*b-6)-240 = 0
24*b-264 = 0
24*b-264 = 0
24*b-264 = 0 // + 264
24*b = 264 // : 24
b = 264/24
b = 11
b = 11
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