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n in (-oo:+oo)
(-5*n)/4 = 15/12 // - 15/12
(-5*n)/4-(15/12) = 0
(-5*n)/4-5/4 = 0
-5/4*n-5/4 = 0 // + 5/4
-5/4*n = 5/4 // : -5/4
n = 5/4/(-5/4)
n = -1
n = -1
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