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x in (-oo:+oo)
(2/3)*n = 5*k+7 // - 5*k+7
(2/3)*n-(5*k)-7 = 0
(2/3)*n-5*k-7 = 0
2/3*n-5*k-7 = 0
x naleu017Cy do R
x in (-oo:+oo)
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