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b in (-oo:+oo)
4 = b-8*(8/12) // - b-8*(8/12)
4-b-(-8*(8/12)) = 0
16/3-b+4 = 0
28/3-b = 0 // - 28/3
-b = -28/3 // * -1
b = 28/3
b = 28/3
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