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b in (-oo:+oo)
-3*b-3 = 7*b-33 // - 7*b-33
33-3*b-(7*b)-3 = 0
33-3*b-7*b-3 = 0
30-10*b = 0 // - 30
-10*b = -30 // : -10
b = -30/(-10)
b = 3
b = 3
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