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n in (-oo:+oo)
48/7 = 4*n+3*n-(1/7) // - 4*n+3*n-(1/7)
48/7-(4*n)-(3*n)+1/7 = 0
48/7-4*n-3*n+1/7 = 0
7-7*n = 0 // - 7
-7*n = -7 // : -7
n = -7/(-7)
n = 1
n = 1
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