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x in (-oo:+oo)
y = (3/10)*X-3 // - (3/10)*X-3
y-((3/10)*X)+3 = 0
(-3/10)*X+y+3 = 0
y-3/10*X+3 = 0
x naleu017Cy do R
x in (-oo:+oo)
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