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b in (-oo:+oo)
3*(4*b+3) = 93 // - 93
3*(4*b+3)-93 = 0
3*(4*b+3)-93 = 0
12*b-84 = 0
12*b-84 = 0
12*b-84 = 0 // + 84
12*b = 84 // : 12
b = 84/12
b = 7
b = 7
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