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b in (-oo:+oo)
18/7 = (-4/5)*b+3*b+1 // - (-4/5)*b+3*b+1
18/7-((-4/5)*b)-(3*b)-1 = 0
(4/5)*b-3*b+18/7-1 = 0
11/7-11/5*b = 0 // - 11/7
-11/5*b = -11/7 // : -11/5
b = -11/7/(-11/5)
b = 5/7
b = 5/7
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