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b in (-oo:+oo)
4 = b+1*(-3/2) // - b+1*(-3/2)
4-b-(1*(-3/2)) = 0
3/2-b+4 = 0
11/2-b = 0 // - 11/2
-b = -11/2 // * -1
b = 11/2
b = 11/2
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