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