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x in (-oo:+oo)
f = (4/5)*b+34 // - (4/5)*b+34
f-((4/5)*b)-34 = 0
(-4/5)*b+f-34 = 0
f-4/5*b-34 = 0
x naleu017Cy do R
x in (-oo:+oo)
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