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n in (-oo:+oo)
39 = (42/5)*n // - (42/5)*n
39-((42/5)*n) = 0
(-42/5)*n+39 = 0
39-42/5*n = 0 // - 39
-42/5*n = -39 // : -42/5
n = -39/(-42/5)
n = 65/14
n = 65/14
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