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b in (-oo:+oo)
6*b-(4*b)+7 = 29 // - 29
6*b-(4*b)-29+7 = 0
6*b-4*b-29+7 = 0
2*b-22 = 0 // + 22
2*b = 22 // : 2
b = 22/2
b = 11
b = 11
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