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n in (-oo:+oo)
10 = (4/5)*n-2 // - (4/5)*n-2
2-((4/5)*n)+10 = 0
(-4/5)*n+2+10 = 0
12-4/5*n = 0 // - 12
-4/5*n = -12 // : -4/5
n = -12/(-4/5)
n = 15
n = 15
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