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n in (-oo:+oo)
n/4 = -12.4 // + 12.4
n/4+12.4 = 0
1/4*n+12.4 = 0 // - 12.4
1/4*n = -12.4 // : 1/4
n = -12.4/1/4
n = -49.6
n = -49.6
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