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b in (-oo:+oo)
(-2/7)*b-(5*b)+1/5 = -184/5 // + -184/5
(-2/7)*b-(5*b)+1/5-(-184/5) = 0
(-2/7)*b-5*b+1/5+184/5 = 0
37-37/7*b = 0 // - 37
-37/7*b = -37 // : -37/7
b = -37/(-37/7)
b = 7
b = 7
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