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b in (-oo:+oo)
3*(2*b-7) = -27 // + 27
3*(2*b-7)+27 = 0
3*(2*b-7)+27 = 0
6*b+6 = 0
6*b+6 = 0
6*b+6 = 0 // - 6
6*b = -6 // : 6
b = -6/6
b = -1
b = -1
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