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b in (-oo:+oo)
-2 = b-3*(7/2) // - b-3*(7/2)
-b-(-3*(7/2))-2 = 0
21/2-b-2 = 0
17/2-b = 0 // - 17/2
-b = -17/2 // * -1
b = 17/2
b = 17/2
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