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b in (-oo:+oo)
3*b+2 = 4*b-4 // - 4*b-4
3*b-(4*b)+2+4 = 0
3*b-4*b+2+4 = 0
6-b = 0 // - 6
-b = -6 // * -1
b = 6
b = 6
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