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n in (-oo:+oo)
120/40 = 12*n // - 12*n
120/40-(12*n) = 0
120/40-12*n = 0
3-12*n = 0 // - 3
-12*n = -3 // : -12
n = -3/(-12)
n = 1/4
n = 1/4
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