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x in (-oo:+oo)
(a/20)*n+4/15 = -9/15 // + -9/15
(a/20)*n+4/15-(-9/15) = 0
(a/20)*n+4/15+3/5 = 0
1/20*a*n+13/15 = 0
x naleu017Cy do R
x in (-oo:+oo)
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