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b in (-oo:+oo)
(-1/5)*b-3 = -28/9 // + -28/9
(-1/5)*b-(-28/9)-3 = 0
(-1/5)*b+28/9-3 = 0
1/9-1/5*b = 0 // - 1/9
-1/5*b = -1/9 // : -1/5
b = -1/9/(-1/5)
b = 5/9
b = 5/9
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