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n in (-oo:+oo)
(-3/2)*n = 4/5 // - 4/5
(-3/2)*n-(4/5) = 0
(-3/2)*n-4/5 = 0
-3/2*n-4/5 = 0 // + 4/5
-3/2*n = 4/5 // : -3/2
n = 4/5/(-3/2)
n = -8/15
n = -8/15
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