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b in (-oo:+oo)
9-5*b = 4*b+27 // - 4*b+27
9-5*b-(4*b)-27 = 0
9-5*b-4*b-27 = 0
-9*b-18 = 0 // + 18
-9*b = 18 // : -9
b = 18/(-9)
b = -2
b = -2
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