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