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b in (-oo:+oo)
6*b-(2*b)+3 = 11 // - 11
6*b-(2*b)-11+3 = 0
6*b-2*b-11+3 = 0
4*b-8 = 0 // + 8
4*b = 8 // : 4
b = 8/4
b = 2
b = 2
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