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n in (-oo:+oo)
n-(7*n)+3/10 = -17/10 // + -17/10
n-(7*n)+3/10-(-17/10) = 0
n-7*n+3/10+17/10 = 0
2-6*n = 0 // - 2
-6*n = -2 // : -6
n = -2/(-6)
n = 1/3
n = 1/3
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