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