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n in (-oo:+oo)
6/9 = n/1.5 // - n/1.5
6/9-(n/1.5) = 0
6/9-0.66666667*n = 0
2/3-0.66666667*n = 0 // - 2/3
-0.66666667*n = -2/3 // : -0.66666667
n = -2/3/(-0.66666667)
n = 1
n = 1
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