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n in (-oo:+oo)
n/2.6 = 4 // - 4
n/2.6-4 = 0
0.38461538*n-4 = 0 // + 4
0.38461538*n = 4 // : 0.38461538
n = 4/0.38461538
n = 10.40000012
n = 10.40000012
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