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x in (-oo:+oo)
X-((2/3)*y) = 1/4 // - 1/4
X-((2/3)*y)-(1/4) = 0
X+(-2/3)*y-1/4 = 0
X-2/3*y-1/4 = 0
x należy do R
x in (-oo:+oo)
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