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b in (-oo:+oo)
2-5*b = 4*b+11 // - 4*b+11
2-5*b-(4*b)-11 = 0
2-5*b-4*b-11 = 0
-9*b-9 = 0 // + 9
-9*b = 9 // : -9
b = 9/(-9)
b = -1
b = -1
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