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b in (-oo:+oo)
(4/5)*b+2 = (-1/5)*b+3 // - (-1/5)*b+3
(4/5)*b-((-1/5)*b)-3+2 = 0
(4/5)*b+(1/5)*b-3+2 = 0
b-1 = 0 // + 1
b = 1
b = 1
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