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b in (-oo:+oo)
b/9-(1/2) = 3/4 // - 3/4
b/9-(1/2)-(3/4) = 0
b/9-1/2-3/4 = 0
1/9*b-5/4 = 0 // + 5/4
1/9*b = 5/4 // : 1/9
b = 5/4/1/9
b = 45/4
b = 45/4
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