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b in (-oo:+oo)
b-(6*b)+3 = 43 // - 43
b-(6*b)-43+3 = 0
b-6*b-43+3 = 0
-5*b-40 = 0 // + 40
-5*b = 40 // : -5
b = 40/(-5)
b = -8
b = -8
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