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n in (-oo:+oo)
(2/3)*n+8 = 122/15 // - 122/15
(2/3)*n-(122/15)+8 = 0
(2/3)*n-122/15+8 = 0
2/3*n-2/15 = 0 // + 2/15
2/3*n = 2/15 // : 2/3
n = 2/15/2/3
n = 1/5
n = 1/5
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