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n in (-oo:+oo)
25/15 = n/1.2 // - n/1.2
25/15-(n/1.2) = 0
25/15-0.83333333*n = 0
5/3-0.83333333*n = 0 // - 5/3
-0.83333333*n = -5/3 // : -0.83333333
n = -5/3/(-0.83333333)
n = 2.00000001
n = 2.00000001
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