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b in (-oo:+oo)
3*(6*b-10) = -138 // + 138
3*(6*b-10)+138 = 0
3*(6*b-10)+138 = 0
18*b+108 = 0
18*b+108 = 0
18*b+108 = 0 // - 108
18*b = -108 // : 18
b = -108/18
b = -6
b = -6
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