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n in (-oo:+oo)
n/1.75 = 4 // - 4
n/1.75-4 = 0
0.57142857*n-4 = 0 // + 4
0.57142857*n = 4 // : 0.57142857
n = 4/0.57142857
n = 7.00000002
n = 7.00000002
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