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n in (-oo:+oo)
3.5 = (9/4)*n // - (9/4)*n
3.5-((9/4)*n) = 0
(-9/4)*n+3.5 = 0
3.5-9/4*n = 0 // - 3.5
-9/4*n = -3.5 // : -9/4
n = -3.5/(-9/4)
n = 1.55555556
n = 1.55555556
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