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