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