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n in (-oo:+oo)
n+9/10 = (1/6)*n+109/10 // - (1/6)*n+109/10
n-((1/6)*n)+9/10-(109/10) = 0
n+(-1/6)*n+9/10-109/10 = 0
5/6*n-10 = 0 // + 10
5/6*n = 10 // : 5/6
n = 10/5/6
n = 12
n = 12
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