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n in (-oo:+oo)
(-5/6)*n = -15/2 // + -15/2
(-5/6)*n-(-15/2) = 0
(-5/6)*n+15/2 = 0
15/2-5/6*n = 0 // - 15/2
-5/6*n = -15/2 // : -5/6
n = -15/2/(-5/6)
n = 9
n = 9
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