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n in (-oo:+oo)
1 = 7*n-4*n-2 // - 7*n-4*n-2
1-(-4*n)-(7*n)+2 = 0
4*n-7*n+1+2 = 0
3-3*n = 0 // - 3
-3*n = -3 // : -3
n = -3/(-3)
n = 1
n = 1
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