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n in (-oo:+oo)
5*(5-n) = 45 // - 45
5*(5-n)-45 = 0
5*(5-n)-45 = 0
-5*n-20 = 0
-5*n-20 = 0
-5*n-20 = 0 // + 20
-5*n = 20 // : -5
n = 20/(-5)
n = -4
n = -4
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