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n in (-oo:+oo)
4/1.5 = n/12 // - n/12
4/1.5-(n/12) = 0
2.66666667-1/12*n = 0 // - 2.66666667
-1/12*n = -2.66666667 // : -1/12
n = -2.66666667/(-1/12)
n = 32.00000132
n = 32.00000132
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