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n in (-oo:+oo)
n/2.5 = 16.5/5.5 // - 16.5/5.5
n/2.5-(16.5/5.5) = 0
n/2.5-3 = 0
0.4*n-3 = 0 // + 3
0.4*n = 3 // : 0.4
n = 3/0.4
n = 7.5
n = 7.5
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