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