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b in (-oo:+oo)
b/2-b-(5/4) = 9/4 // - 9/4
b/2-b-(5/4)-(9/4) = 0
b/2-b-5/4-9/4 = 0
-1/2*b-7/2 = 0 // + 7/2
-1/2*b = 7/2 // : -1/2
b = 7/2/(-1/2)
b = -7
b = -7
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