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n in (-oo:+oo)
15/4 = (12*n)/4 // - (12*n)/4
15/4-((12*n)/4) = 0
15/4-3*n = 0
15/4-3*n = 0 // - 15/4
-3*n = -15/4 // : -3
n = -15/4/(-3)
n = 5/4
n = 5/4
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