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n in (-oo:+oo)
(21/10)*n = 7/6 // - 7/6
(21/10)*n-(7/6) = 0
(21/10)*n-7/6 = 0
21/10*n-7/6 = 0 // + 7/6
21/10*n = 7/6 // : 21/10
n = 7/6/21/10
n = 5/9
n = 5/9
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