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b in (-oo:+oo)
3*b-(7*b)+6 = 2 // - 2
3*b-(7*b)-2+6 = 0
3*b-7*b-2+6 = 0
4-4*b = 0 // - 4
-4*b = -4 // : -4
b = -4/(-4)
b = 1
b = 1
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