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b in (-oo:+oo)
-6*b-7 = 6*b-139 // - 6*b-139
139-6*b-(6*b)-7 = 0
139-6*b-6*b-7 = 0
132-12*b = 0 // - 132
-12*b = -132 // : -12
b = -132/(-12)
b = 11
b = 11
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