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b in (-oo:+oo)
6*(4*b-7) = -306 // + 306
6*(4*b-7)+306 = 0
6*(4*b-7)+306 = 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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