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b in (-oo:+oo)
-2*b-(4/9) = -94/9 // + -94/9
-2*b-(4/9)-(-94/9) = 0
94/9-2*b-4/9 = 0
10-2*b = 0 // - 10
-2*b = -10 // : -2
b = -10/(-2)
b = 5
b = 5
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