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b in (-oo:+oo)
-12 = (3/4)*b // - (3/4)*b
-((3/4)*b)-12 = 0
(-3/4)*b-12 = 0
-3/4*b-12 = 0 // + 12
-3/4*b = 12 // : -3/4
b = 12/(-3/4)
b = -16
b = -16
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