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n in (-oo:+oo)
(-4/5)*n = -2/15 // + -2/15
(-4/5)*n-(-2/15) = 0
(-4/5)*n+2/15 = 0
2/15-4/5*n = 0 // - 2/15
-4/5*n = -2/15 // : -4/5
n = -2/15/(-4/5)
n = 1/6
n = 1/6
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