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b in (-oo:+oo)
(-1/2)*b-9 = -69/8 // + -69/8
(-1/2)*b-(-69/8)-9 = 0
(-1/2)*b+69/8-9 = 0
-1/2*b-3/8 = 0 // + 3/8
-1/2*b = 3/8 // : -1/2
b = 3/8/(-1/2)
b = -3/4
b = -3/4
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