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n in (-oo:+oo)
1/50 = n/2.5 // - n/2.5
1/50-(n/2.5) = 0
1/50-0.4*n = 0
1/50-0.4*n = 0 // - 1/50
-0.4*n = -1/50 // : -0.4
n = -1/50/(-0.4)
n = 0.05
n = 0.05
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