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n in (-oo:+oo)
1/3-(7*n) = 10/9 // - 10/9
1/3-(7*n)-(10/9) = 0
1/3-7*n-10/9 = 0
-7*n-7/9 = 0 // + 7/9
-7*n = 7/9 // : -7
n = 7/9/(-7)
n = -1/9
n = -1/9
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