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n in (-oo:+oo)
15-((2/9)*n) = (2/9)*n-1 // - (2/9)*n-1
1-((2/9)*n)-((2/9)*n)+15 = 0
(-2/9)*n+(-2/9)*n+1+15 = 0
16-4/9*n = 0 // - 16
-4/9*n = -16 // : -4/9
n = -16/(-4/9)
n = 36
n = 36
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