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n in (-oo:+oo)
100/4-(n/2.83) = 0
100/4-0.35335689*n = 0
25-0.35335689*n = 0 // - 25
-0.35335689*n = -25 // : -0.35335689
n = -25/(-0.35335689)
n = 70.75000009
n = 70.75000009
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