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b in (-oo:+oo)
9-((1/2)*b) = (8/2)*b+5 // - (8/2)*b+5
9-((1/2)*b)-((8/2)*b)-5 = 0
(-1/2)*b-4*b-5+9 = 0
4-9/2*b = 0 // - 4
-9/2*b = -4 // : -9/2
b = -4/(-9/2)
b = 8/9
b = 8/9
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