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b in (-oo:+oo)
6*(-4*b-7) = -138 // + 138
6*(-4*b-7)+138 = 0
6*(-4*b-7)+138 = 0
96-24*b = 0
96-24*b = 0
96-24*b = 0 // - 96
-24*b = -96 // : -24
b = -96/(-24)
b = 4
b = 4
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