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x in (-oo:+oo)
6*X-((1/2)*Y) = 7 // - 7
6*X-((1/2)*Y)-7 = 0
6*X+(-1/2)*Y-7 = 0
6*X-1/2*Y-7 = 0
x naleu017Cy do R
x in (-oo:+oo)
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