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n in (-oo:+oo)
(-4/5)*n = -10 // + 10
(-4/5)*n+10 = 0
10-4/5*n = 0 // - 10
-4/5*n = -10 // : -4/5
n = -10/(-4/5)
n = 25/2
n = 25/2
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