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b in (-oo:+oo)
3/4-(3*b) = 27/4 // - 27/4
3/4-(3*b)-(27/4) = 0
3/4-3*b-27/4 = 0
-3*b-6 = 0 // + 6
-3*b = 6 // : -3
b = 6/(-3)
b = -2
b = -2
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