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n in (-oo:+oo)
14/21.2 = n/15 // - n/15
14/21.2-(n/15) = 0
0.66037736-1/15*n = 0 // - 0.66037736
-1/15*n = -0.66037736 // : -1/15
n = -0.66037736/(-1/15)
n = 9.9056599
n = 9.9056599
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