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n in (-oo:+oo)
(-3/5)*(15-(45*n)) = 0
(-3/5)*(15-45*n) = 0
-3/5*(15-45*n) = 0
( -3/5 )
-3/5 = 0
n belongs to the empty set
( 15-45*n )
15-45*n = 0 // - 15
-45*n = -15 // : -45
n = -15/(-45)
n = 1/3
n = 1/3
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