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b in (-oo:+oo)
(4/5)*b-4 = (-9/10)*b+1 // - (-9/10)*b+1
(4/5)*b-((-9/10)*b)-4-1 = 0
(4/5)*b+(9/10)*b-4-1 = 0
17/10*b-5 = 0 // + 5
17/10*b = 5 // : 17/10
b = 5/17/10
b = 50/17
b = 50/17
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