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n in (-oo:+oo)
0.4*n-(1/7) = 0
0.4*n-1/7 = 0
0.4*n-1/7 = 0 // + 1/7
0.4*n = 1/7 // : 0.4
n = 1/7/0.4
n = 0.35714285
n = 0.35714285
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