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n in (-oo:+oo)
-15 = (3*n)/5 // - (3*n)/5
-((3*n)/5)-15 = 0
(-3/5)*n-15 = 0
-3/5*n-15 = 0 // + 15
-3/5*n = 15 // : -3/5
n = 15/(-3/5)
n = -25
n = -25
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