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n in (-oo:+oo)
6 = (2/15)*n-6 // - (2/15)*n-6
6-((2/15)*n)+6 = 0
(-2/15)*n+6+6 = 0
12-2/15*n = 0 // - 12
-2/15*n = -12 // : -2/15
n = -12/(-2/15)
n = 90
n = 90
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