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b in (-oo:+oo)
4*(6*b-9) = -60 // + 60
4*(6*b-9)+60 = 0
4*(6*b-9)+60 = 0
24*b+24 = 0
24*b+24 = 0
24*b+24 = 0 // - 24
24*b = -24 // : 24
b = -24/24
b = -1
b = -1
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