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b in (-oo:+oo)
6*(1*b+3) = -36 // + 36
6*(1*b+3)+36 = 0
6*(b+3)+36 = 0
6*(b+3)+36 = 0
6*b+54 = 0
6*b+54 = 0
6*b+54 = 0 // - 54
6*b = -54 // : 6
b = -54/6
b = -9
b = -9
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