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b in (-oo:+oo)
3*(1-1*b) = 24 // - 24
3*(1-1*b)-24 = 0
3*(1-b)-24 = 0
3*(1-b)-24 = 0
-3*b-21 = 0
-3*b-21 = 0
-3*b-21 = 0 // + 21
-3*b = 21 // : -3
b = 21/(-3)
b = -7
b = -7
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