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