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b in (-oo:+oo)
2 = b+10/(-4) // - b+10/(-4)
2-b-(10/(-4)) = 0
5/2-b+2 = 0
9/2-b = 0 // - 9/2
-b = -9/2 // * -1
b = 9/2
b = 9/2
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