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n in (-oo:+oo)
-((3/7)*n)-10 = 5*n-(412/7) // - 5*n-(412/7)
412/7-((3/7)*n)-(5*n)-10 = 0
(-3/7)*n-5*n+412/7-10 = 0
342/7-38/7*n = 0 // - 342/7
-38/7*n = -342/7 // : -38/7
n = -342/7/(-38/7)
n = 9
n = 9
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