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n in (-oo:+oo)
5-7*n = 5*n-7 // - 5*n-7
5-7*n-(5*n)+7 = 0
5-7*n-5*n+7 = 0
12-12*n = 0 // - 12
-12*n = -12 // : -12
n = -12/(-12)
n = 1
n = 1
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