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n in (-oo:+oo)
n/1.4-2.9 = 5.11 // - 5.11
n/1.4-5.11-2.9 = 0
0.71428571*n-8.01 = 0 // + 8.01
0.71428571*n = 8.01 // : 0.71428571
n = 8.01/0.71428571
n = 11.21400007
n = 11.21400007
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