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n in (-oo:+oo)
5-(7*n) = 43/10 // - 43/10
5-(7*n)-(43/10) = 0
5-7*n-43/10 = 0
7/10-7*n = 0 // - 7/10
-7*n = -7/10 // : -7
n = -7/10/(-7)
n = 1/10
n = 1/10
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