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x in (-oo:+oo)
X = 8/9-((7*y)/9) // - 8/9-((7*y)/9)
X+(7*y)/9-(8/9) = 0
X+(7*y)/9-8/9 = 0
X+7/9*y-8/9 = 0
x należy do R
x in (-oo:+oo)
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