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n in (-oo:+oo)
(5/6)*n-(9/10) = -1/15 // + -1/15
(5/6)*n-(9/10)-(-1/15) = 0
(5/6)*n-9/10+1/15 = 0
5/6*n-5/6 = 0 // + 5/6
5/6*n = 5/6 // : 5/6
n = 5/6/5/6
n = 1
n = 1
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