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b in (-oo:+oo)
192 = 12*(1/2)*b // - 12*(1/2)*b
192-(12*(1/2)*b) = 0
192-6*b = 0
192-6*b = 0 // - 192
-6*b = -192 // : -6
b = -192/(-6)
b = 32
b = 32
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