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