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n in (-oo:+oo)
2*(7-4*n) = 6 // - 6
2*(7-4*n)-6 = 0
2*(7-4*n)-6 = 0
8-8*n = 0
8-8*n = 0
8-8*n = 0 // - 8
-8*n = -8 // : -8
n = -8/(-8)
n = 1
n = 1
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