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n in (-oo:+oo)
-20 = n/4-8 // - n/4-8
8-(n/4)-20 = 0
-1/4*n-12 = 0 // + 12
-1/4*n = 12 // : -1/4
n = 12/(-1/4)
n = -48
n = -48
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