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n in (-oo:+oo)
2.1/2 = 5*n // - 5*n
2.1/2-(5*n) = 0
2.1/2-5*n = 0
1.05-5*n = 0 // - 1.05
-5*n = -1.05 // : -5
n = -1.05/(-5)
n = 0.21
n = 0.21
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