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n in (-oo:+oo)
9*n = 15/7-2 // - 15/7-2
9*n-(15/7)+2 = 0
9*n-15/7+2 = 0
9*n-1/7 = 0 // + 1/7
9*n = 1/7 // : 9
n = 1/7/9
n = 1/63
n = 1/63
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