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b in (-oo:+oo)
6*b+6 = 138-5*b // - 138-5*b
6*b-(-5*b)-138+6 = 0
6*b+5*b-138+6 = 0
11*b-132 = 0 // + 132
11*b = 132 // : 11
b = 132/11
b = 12
b = 12
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