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b in (-oo:+oo)
7-6*b = 34-3*b // - 34-3*b
7-6*b-(-3*b)-34 = 0
3*b-6*b-34+7 = 0
-3*b-27 = 0 // + 27
-3*b = 27 // : -3
b = 27/(-3)
b = -9
b = -9
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