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x in (-oo:+oo)
(2/3)*r-7 = 9-((2/3)*u) // - 9-((2/3)*u)
(2/3)*r+(2/3)*u-9-7 = 0
2/3*r+2/3*u-16 = 0
x naleu017Cy do R
x in (-oo:+oo)
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