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n in (-oo:+oo)
7/5-((3*n)/10) = 1/5 // - 1/5
7/5-((3*n)/10)-(1/5) = 0
(-3/10)*n+7/5-1/5 = 0
6/5-3/10*n = 0 // - 6/5
-3/10*n = -6/5 // : -3/10
n = -6/5/(-3/10)
n = 4
n = 4
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