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x in (-oo:+oo)
y = (2/5)*X-(4/8) // - (2/5)*X-(4/8)
y-((2/5)*X)+4/8 = 0
(-2/5)*X+y+4/8 = 0
y-2/5*X+1/2 = 0
x naleu017Cy do R
x in (-oo:+oo)
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