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b in (-oo:+oo)
6*(2*b+4) = -48 // + 48
6*(2*b+4)+48 = 0
6*(2*b+4)+48 = 0
12*b+72 = 0
12*b+72 = 0
12*b+72 = 0 // - 72
12*b = -72 // : 12
b = -72/12
b = -6
b = -6
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