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b in (-oo:+oo)
b+4 = 3*b-6 // - 3*b-6
b-(3*b)+4+6 = 0
b-3*b+4+6 = 0
10-2*b = 0 // - 10
-2*b = -10 // : -2
b = -10/(-2)
b = 5
b = 5
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