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n in (-oo:+oo)
2.4/6 = n/9 // - n/9
2.4/6-(n/9) = 0
0.4-1/9*n = 0 // - 0.4
-1/9*n = -0.4 // : -1/9
n = -0.4/(-1/9)
n = 3.60000004
n = 3.60000004
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