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b in (-oo:+oo)
6000 = b+12*(-4000/3) // - b+12*(-4000/3)
6000-b-(12*(-4000/3)) = 0
6000-b+16000 = 0
22000-b = 0 // - 22000
-b = -22000 // * -1
b = 22000
b = 22000
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