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n in (-oo:+oo)
12 = 10*n-(2/4) // - 10*n-(2/4)
2/4-(10*n)+12 = 0
2/4-10*n+12 = 0
25/2-10*n = 0 // - 25/2
-10*n = -25/2 // : -10
n = -25/2/(-10)
n = 5/4
n = 5/4
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