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x in (-oo:+oo)
(2/3)*w-((4/3)*w)+(7/9)*y-((5/9)*y) = 0
(2/3)*w+(-4/3)*w+(7/9)*y+(-5/9)*y = 0
2/9*y-2/3*w = 0
x naleu017Cy do R
x in (-oo:+oo)
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