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n in (-oo:+oo)
(5/6)*n = -5/9 // + -5/9
(5/6)*n-(-5/9) = 0
(5/6)*n+5/9 = 0
5/6*n+5/9 = 0 // - 5/9
5/6*n = -5/9 // : 5/6
n = -5/9/5/6
n = -2/3
n = -2/3
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