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b in (-oo:+oo)
6*(-2*b-7) = -174 // + 174
6*(-2*b-7)+174 = 0
6*(-2*b-7)+174 = 0
132-12*b = 0
132-12*b = 0
132-12*b = 0 // - 132
-12*b = -132 // : -12
b = -132/(-12)
b = 11
b = 11
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