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n in (-oo:+oo)
n/2-2 = 4.12 // - 4.12
n/2-4.12-2 = 0
1/2*n-6.12 = 0 // + 6.12
1/2*n = 6.12 // : 1/2
n = 6.12/1/2
n = 12.24
n = 12.24
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