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x in (-oo:+oo)
y = (-1/3)*X+7 // - (-1/3)*X+7
y-((-1/3)*X)-7 = 0
(1/3)*X+y-7 = 0
1/3*X+y-7 = 0
x naleu017Cy do R
x in (-oo:+oo)
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